Statistical processor

Abstract

A statistical processor has a calculating section for calculating and providing data required to perform a statistical processing on the basis of supplied sampling data every time when the sampling data are supplied to the statistical processor; a plurality of registers for respectively storing the data calculated and provided by the calculating section; a statistical calculating section for calculating and providing desirable statistical results on the basis of data transmitted from the registers; and a control section for controlling the operations of the calculating section, the registers and the statistical calculating section.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a statistical processor for performing a regression analysis with respect to sampling data.

2. Description of the Related Art

A regression analysis (least square method) for determining a function representing transition of plural data respectively having deviations is performed by calculating a regression straight line in the case of a linear function and a regression curve in the case of a function of the n-th order where n designates an integer equal to or greater than two. In the case of the regression straight line, coefficients .alpha. and .beta. are calculated by the following normal equation (1). ##EQU1##

In the case of the regression curve, especially, a regression curve of the second order, coefficients .alpha., .beta. and .gamma. are calculated by the following normal equation (2). ##EQU2##

In the equations (1) and (2), the following formulas are defined. ##EQU3##

Thus, a regression straight line function represented by Y=.alpha.+.beta.X is estimated by the calculation of the coefficients .alpha. and .beta. in the case of the linear function. A regression curve function represented by Y=.alpha.+.beta.X+.gamma.X.sup.2 is estimated by the calculation of the coefficients .alpha., .beta. and .gamma. in the case of the function of the second order.

There is a case in which supplied data are unstable and the operation of a processor is controlled to provide more stable output data in a processing for outputting data periodically processed. In such a case, there is an optimum method for controlling the operation of the processor in which the output data are fed back and transition of the output data is analyzed by the regression analysis thereof. In general, such a processing with respect to the regression analysis is performed by a microprocessor.

However, when such a processing is performed for a very short period, it is necessary to control the operation of the microprocessor using the regression analysis at a high speed in particular, a real-time processing must be performed with respect to the regression analysis. In such a case, there are less problems when the linear function represented by a straight line are calculated since the processing is not complicated. However, when the function of the more than two order represented by a curve is calculated, it is necessary to perform many processings having more than several hundred steps so that it is impossible to perform the real-time processing by the microprocessor. For example, the respective coefficients .alpha., .beta. and .gamma. are concretely calculated by the following formulas (3) to (6). ##EQU4##

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide a statistical processor for performing a statistical processing such as a regression analysis at the real time in accordance with the number of sampling data.

The above object of the present invention can be achieved by a statistical processor comprising a calculating section for calculating and providing data required to perform a statistical processing on the basis of supplied sampling data every time when the sampling data are supplied to the statistical processor; a plurality of registers for respectively storing the data calculated and provided by the calculating section; a statistical calculating section for calculating and providing desirable statistical results on the basis of data transmitted from the registers; and a control section for controlling the operations of the calculating section, the registers and the statistical calculating section.

The calculating section calculates and provides data such as an accumulated sum, etc. required to perform a statistical processing by a control signal transmitted from the control section every time when the sampling data are supplied to the statistical processor. These data are stored to the respective registers. Accordingly, for example, it is not necessary to stop the operation of the statistical processor until all the sampling data required to perform a regression analysis are supplied to the statistical processor.

Thus, the data required to perform the statistical processing are stored to the registers in advance and the statistical calculating section for performing the statistical processing reads required data out of the registers by the control signal transmitted from the control section so as to calculate and provide desirable statistical results. Thus, it is possible to perform a statistical processing such as regression analysis at the real time.

Further objects and advantages of the present invention will be apparent from the following description of the preferred embodiments of the present invention as illustrated in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1a and 1b are a block diagram showing the construction of a statistical processor in one embodiment of the present invention; and

FIG. 2 is a timing chart showing the operation of the statistical processor shown in FIGS. 1a and 1b.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The preferred embodiment of a statistical processor in the present invention will next be described in detail with reference to the accompanying drawings.

FIGS. 1a and 1b shows the construction of a statistical processor for performing a regression analysis of the second order in accordance with one embodiment of the present invention. In this embodiment, the statistical processor is constructed by registers, a multiplier, etc. For example, the statistical processor is used in a control section, etc. for executing voltage control of a copying operation section in a copying machine.

An X-register 11 holds data value X.sub.i supplied as sampling data for performing a statistical processing through an input terminal C from an unillustrated computer for control, etc. The X-register 11 is connected to a data selector 14. Similarly, a Y-register 12 holds data value Y.sub.i supplied as sampling data for performing a statistical processing through an input terminal D from the above computer for control, etc. The Y-register 12 is connected to a data selector 15. In addition to the above data values X.sub.i and Y.sub.i, data indicative of constant value one, output data of a register group 13 described later, and output data of a register 18 described later are also supplied to the data selectors 14 and 15. The data selectors 14 and 15 are circuits for selecting one of the above data by a control signal transmitted from a controller 24.

The controller 24 is a circuit for controlling the operation of each of constructional portions in the statistical processor in this embodiment. The controller 24 switches processing modes by a mode switching signal inputted through an input terminal A and transmits a control signal in synchronization with a clock signal for the controller inputted through an input terminal B.

Output terminals of the data selectors 14 and 15 are connected to a multiplier 20 for performing a multiplying operation with respect to data supplied from the data selectors 14 and 15. An output terminal of the multiplier 20 is connected to an adder-subtracter 21 and a data selector 17.

The adder-subtracter 21 is connected to an output terminal of a data selector 16 and performs an adding or subtracting operation with respect to data supplied from the multiplier 20 and the data selector 16 by the control signal transmitted from the controller 24.

The data selector 16 is a circuit for selecting one of supplied data indicative of numeral zero and data supplied from the register group 13 described later by the control signal transmitted from the controller 24.

The data selector 17 is a circuit for selecting one of data supplied from the multiplier 20 and data supplied from the register group 13 by the control signal transmitted from the controller 24.

An output terminal of the data selector 17 is connected to a register 18 for receiving a clock signal and the control signal from the controller 24. An output terminal of the register 18 is connected to the data selectors 14 and 15 as mentioned above.

An output terminal of the adder-subtracter 21 is connected to the register group 13. As shown in FIG. 1, the register group 13 is composed of a plurality of registers for separately storing respective data such as .SIGMA.X.sub.i, .SIGMA.X.sub.i.sup.2, .SIGMA.X.sub.i.sup.3, the number n of supplying times of sampling data, work, matrix A, etc. calculated by using the above data selectors 14 and 15, the multiplier 20, the adder-subtracter 21, etc. The register group 13 stores the results of calculated data transmitted from the adder-subtracter 21 to a predetermined register by the control signal transmitted from the controller 24. The register group 13 also transmits desirable data from a predetermined register by the control signal from the controller 24. A counter 23 counts the number n of supplying times of sampling data supplied to the input terminals A and B and is connected to an n-register 13h of the register group 13. A clock signal is transmitted to the register group 13.

As mentioned above, the output terminal of the register group 13 is connected to the data selectors 14, 15, 16 and 17 and a data selector 19. The output terminal of the register group 13 is also connected to the data selector 19 through a divider 22.

The divider 22 is a circuit for performing a dividing operation to calculate the coefficients .alpha., .beta. and .gamma. of the regression straight line and the regression curve as mentioned above on the basis of data transmitted from a predetermined register within the register group 13 by the control signal of the controller 24.

The data selector 19 is a circuit for selecting one of data supplied from a register of the register group 13 and data supplied from the divider 22 by the control signal transmitted from the controller 24. The data selector 19 transmits the selected data to an output terminal 25.

The operation of the statistical processor mentioned above will next be described with reference to FIG. 2. FIG. 2 shows the following data shown in FIG. 1a.

Data at the input terminal C, data at the input terminal D, data transmitted from the data selector 14, data transmitted from the data selector 15, data stored in the register 18, data transmitted from the data selector 16, data stored into the respective registers within the register group 13, and data of the counter 23.

The respective constructional portions of the statistical processor are operated in synchronization with a clock signal.

A first sampling data value X.sub.1 is transmitted to the input terminal C and a first sampling data value Y.sub.1 is transmitted to the input terminal D from an unillustrated computer for control, etc.

The data value X.sub.1 is inputted and stored to the X-register 11 as first sampling data by a first clock signal from the input terminal C. Similarly, the data value Y.sub.1 is inputted and stored to the Y-register 12 from the input terminal D. The data selector 14 selects output data of the X-register 11 by a second clock signal and a control signal transmitted from the controller 24. The data selector 15 selects data indicative of numeral one by the control signal transmitted from the controller 24. The data value X.sub.1 is transmitted from the X-register 11 through the data selector 14 to the multiplier 20. The data indicative of numeral one are transmitted from the data selector 15 to the multiplier 20. Accordingly, the multiplier 20 multiplies the data value X.sub.1 by the numeral one so that the multiplied value X.sub.1 is transmitted to the adder-subtracter 21 and the data selector 17. At this time, data indicative of constant value zero selected by the data selector 16 are supplied to the adder-subtracter 21 by the control signal transmitted from the controller 24. Further, the operation of the adder-subtracter 21 is controlled to perform an adding operation by the control signal transmitted from the controller 24. Therefore, the adder-subtracter 21 adds the value zero to the value X.sub.1 so that the added value X.sub.1 is transmitted to the register group 13. Thus, the register group 13 stores the transmitted value X.sub.1 to a .SIGMA.X.sub.i register 13a by the control signal transmitted from the controller 24. The data selector 17 selects output data of the multiplier 20, i.e., the value X.sub.1 by the control signal transmitted from the controller 24 and transmits this value X.sub.1 to the register 18. Thus, the value X.sub.1 is stored to the register 18.

The data selector 14 selects data indicative of constant value one by a third clock signal and the control signal transmitted from the controller 24. The data selector 15 selects output data value Y.sub.1 of the Y-register 12 by the control signal transmitted from the controller 24. The data value Y.sub.1 is transmitted from the Y-register 12 through the data selector 15 to the multiplier 20. The data indicative of value one are transmitted from the data selector 14 to the multiplier 20. Accordingly, the multiplier 20 multiplies the data value Y.sub.1 by the value one so that the multiplied value Y.sub.1 transmitted to the adder-subtracter 21 and the data selector 17. At this time, the data indicative of constant value zero selected by the data selector 16 are supplied to the adder-subtracter 21 by the control signal transmitted from the controller 24. Further, the operation of the adder-subtracter 21 is control led to perform an adding operation by the control signal transmitted from the controller 24. Therefore, the adder-subtracter 21 adds the constant value zero to the value Y.sub.1 so that the added value Y.sub.1 is transmitted to the register group 13. Thus, the register group 13 stores the transmitted value Y.sub.1 to a .SIGMA.Y.sub.i register 13e by the control signal transmitted from the controller 24. The data selector 17 performs the above-mentioned operation and transmits output data of the multiplier 20 to the register 18. At this time, no output data of the multiplier 20 are inputted to the register 18 by the control signal of the controller 24. Accordingly, the register 18 holds an operating state in which the value X.sub.1 is stored to this register 18.

When a fourth clock signal is transmitted to the X-register 11 and the Y-register 12, the X-register 11 transmits the data value X.sub.1 to the data selector 14 and the Y-selector 12 transmits the data value Y.sub.1 to the data selector 15. In this case, the data selectors 14 and 15 respectively select the data values of the X-register 11 and the Y-register 12 by the control signal of the controller 24. Thus, the data values X.sub.1 and Y.sub.1 are transmitted to the multiplier 20. The multiplier 20 performs a multiplying operation with respect to these data values so that the multiplied value X.sub.1 Y.sub.1 is transmitted to the adder-subtracter 21 and the data selector 17. In this case, the operations of the register 18 and the adder-subtracter 21 are similar to those in the above case of the second clock signal. Thus, data indicative of the value X.sub.1 Y.sub.1 are transmitted from the adder-subtracter 21 to the register group 13. The register group 13 stores these data to a .SIGMA.X.sub.i Y.sub.i register 13f by the control signal of the controller 24.

When a fifth clock signal is transmitted to the X-register 11 and the Y-register 12, the data selector 14 selects output data of the X-register 11 by the control signal of the controller 24 and the data selector 15 selects data indicative of the value X.sub.1 transmitted from the register 18 by the control signal of the controller 24. Thus, the multiplier 20 performs a multiplying operation with respect to the values X.sub.1 and X.sub.1 so that the multiplied data value X.sub.1.sup.2 is transmitted to the data selector 17 and the adder-subtracter 21. The adder-subtracter 21 performs the above-mentioned operation and transmits the data value X.sub.1 to the register group 13. The register group 13 stores this value X.sub.1.sup.2 to a .SIGMA.X.sub.i.sup.2 register 13b by the control signal of the controller 24. The data selector 17 transmits the data value X.sub.1 to the register 18. The register 18 stores this data value X.sub.1.sup.2 by the control signal of the controller 24.

When a sixth clock signal is transmitted to the X-register 11 and the Y-register 12, the data selector 14 selects the value X.sub.1.sup.2 as output data of the register 18 by the control signal of the controller 24 and the data selector 15 selects data indicative of the value Y.sub.1 transmitted from the Y-register 12 by the control signal of the controller 24. Thus, the multiplier 20 performs a multiplying operation with respect to the values X.sub.1.sup.2 and Y.sub.1 so that the multiplied data value X.sub.1.sup.2 Y.sub.1 is transmitted to the data selector 17 and the adder-subtracter 21. The adder-subtracter 21 performs the above-mentioned operation and transmits the data value X.sub.1.sup.2 Y.sub.1 to the register group 13. The register group 13 stores this value X.sub.1.sup.2 Y.sub.1 to a .SIGMA.X.sub.i.sup.2 Y.sub.i register 13g by the control signal of the controller 24. The data selector 17 transmits the data value X.sub.1.sup.2 Y.sub.1 to the register 18. However, no data value X.sub.1.sup.2 Y.sub.1 is inputted and stored to the register 18 by the control signal of the controller 24.

When a seventh clock signal is transmitted to the X-register 11 and the Y-register 12, the data selector 14 selects the output data value X.sub.1 of the X-register 11 by the control signal of the controller 24 and the data selector 15 selects the data value X.sub.1 transmitted from the register 18 by the control signal of the controller 24. Thus, the multiplier 20 performs a multiplying operation with respect to the values X.sub.1 and X.sub.1.sup.2 so that the multiplied data value X.sub.1 is transmitted to the data selector 17 and the adder-subtracter 21. The adder-subtracter 21 performs the above-mentioned operation and transmits the data value X.sub.1.sup.3 to the register group 13. The register group 13 stores this value X.sub.1.sup.3 to a .SIGMA.X.sub.i.sup.3 register 13c by the control signal of the controller 24. The data selector 17 transmits the data value X.sub.1.sup.3 to the register 18. The register 18 stores this data value X.sub.1.sup.3 by the control signal of the controller 24.

When an eighth clock signal is transmitted to the X-register 11 and the Y-register 12, the data selector 14 selects the output data value X.sub.1 of the X-register 11 by the control signal of the controller 24 and the data selector 15 selects the data value X.sub.1.sup.3 transmitted from the register 18 by the control signal of the controller 24. Thus, the multiplier 20 performs a multiplying operation with respect to the values X.sub.1 and X.sub.1.sup.3 so that the multiplied data value X.sub.1.sup.4 is transmitted to the data selector 17 and the adder-subtracter 21. The adder-subtracter 21 performs the above-mentioned operation and transmits the data value X.sub.1.sup.4 to the register group 13. The register group 13 stores this value X.sub.1.sup.4 to a .SIGMA.X.sub.i.sup.4 register 13d by the control signal of the controller 24. The data selector 17 transmits the data value X.sub.1.sup.4 to the register 18. However, no data value X.sub.1.sup.4 is inputted and stored to the register 18 by the control signal of the controller 24.

When the processings with respect to the eighth clock signal are performed, the next sampling data value X.sub.2 is transmitted to the input terminal C and the next sampling data value Y.sub.2 is transmitted to the input terminal D.

When a ninth clock signal is transmitted to the X-register 11 and the Y-register 12, the operation of the statistical processor is approximately similar to that in the case of the first clock signal. Namely, the data selector 14 selects output data of the X-register 11 by the control signal transmitted from the controller 24. The data selector 15 selects data indicative of numeral one by the control signal transmitted from the controller 24. Thus, data indicative of the value X.sub.2 are supplied from the data selector 14 to the multiplier 20 and data indicative of the numeral one are supplied from the data selector 15 to the multiplier 20. The multiplier 20 performs a multiplying operation with respect to the values X.sub.2 and one so that the multiplied value X.sub.2 is transmitted to the adder-subtracter 21 and the data selector 17. When the eighth clock signal is transmitted to the X-register 11 and the Y-register 12, the stored data value X.sub.1 is transmitted from the register 13a within the register group 13 by the control signal of the controller 24. As shown by "output of data selector 16" in FIG. 2, the data selector 16 selects output data of the register 13a by the control signal of the controller 24 and transmits these output data indicative of the value X.sub.1 to the adder-subtracter 21. The operation of the adder-subtracter 21 is controlled to perform an adding operation by the control signal transmitted from the controller 24. Thus, the adder-subtracter 21 adds the value X.sub.2 to the value X.sub.1 so that the added value X.sub.1 +X.sub.2 is transmitted to the register group 13. The register group 13 stores the transmitted value X.sub.1 +X.sub.2 to the .SIGMA.X.sub.i register 13a by the control signal transmitted from the controller 24. The data selector 17 selects output data of the multiplier 20, i.e., the value X.sub.2 by the control signal transmitted from the controller 24 and transmits this value X.sub.2 to the register 18. Thus, the value X.sub.2 is stored to the register 18.

When a tenth clock signal is transmitted to the X-register 11 and the Y-register 12 as a first clock signal after a regression analysis begins to be performed, the data selector 14 selects data indicative of constant value one by the control signal transmitted from the controller 24. The data selector 15 selects output data value Y.sub.2 of the Y-register 12 by the control signal transmitted from the controller 24. The data value Y.sub.2 is transmitted from the Y-register 12 through the data selector 15 to the multiplier 20. The constant value one is transmitted from the data selector 14 to the multiplier 20. The multiplier 20 thus performs a multiplying operation with respect to the values Y.sub.2 and one so that the multiplied value Y.sub.2 is transmitted to the adder-subtracter 21 and the data selector 17. When the tenth clock signal is transmitted to the X-register 11 and the Y-register 12, the stored data value Y.sub.1 is transmitted from the register 13e within the register group 13 by the control signal of the controller 24. As shown by "output of data selector 16" in FIG. 2, the data selector 16 selects output data of the register 13e by the control signal of the controller 24 and transmits these output data indicative of the value Y.sub.1 to the adder-subtracter 21. The operation of the adder-subtracter 21 is controlled to perform an adding operation by the control signal transmitted from the controller 24. Thus, the adder-subtracter 21 adds the value Y.sub.2 to the value Y.sub.1 so that the added value Y.sub.1 +Y.sub.2 is transmitted to the register group 13. The register group 13 stores the transmitted value Y.sub.1 +Y.sub.2 to the .SIGMA.Y.sub.1 register 13e by the control signal transmitted from the controller 24. The data selector 17 performs the above-mentioned operation and transmits output data of the multiplier 20 to the register 18. However, at this time, no output data of the multiplier 20 are inputted to the register 18 by the control signal of the controller 24. Therefore, the register 18 holds an operating state in which the value X.sub.2 is stored into the register 18.

As mentioned above, the values stored into the respective registers of the register group 13 are sequentially replaced by values provided by performing an adding operation with respect to the stored values and values calculated by sampling data every time when these sampling data are supplied to the input terminals C and D. Then, the replaced values are stored to the respective registers. Accordingly, the added values are stored into the respective registers of the register group 13.

The respective coefficients .alpha., .beta. and .gamma. are calculated from each of the obtained values .SIGMA.X.sub.i, .SIGMA.X.sub.i.sup.2, .SIGMA.X.sub.i.sup.3, .SIGMA.X.sub.i.sup.4, .SIGMA.Y.sub.i, .SIGMA.X.sub.i Y.sub.i, .SIGMA.X.sub.i.sup.2 Y.sub.i, and the number n of supplied sampling data by using the statistical processor in the present invention as follows.

The respective coefficients .alpha., .beta. and .gamma. are calculated by the above-mentioned formulas (3), (4) and (5). The above matrix A can be calculated by the above formula (6). For example, the first term of the formula (6), i.e., n .SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 is calculated as follows.

When a first clock signal is transmitted to the X-register 11 and the Y-register 12, a stored value .SIGMA.X.sub.i.sup.2 is transmitted from the .SIGMA.X.sub.i.sup.2 register 13b within the register group 13 to the data selector 14, etc. by a control signal of the controller 24. At this time, the data selector 14 selects the above value .SIGMA.X.sub.i.sup.2 by the control signal of the controller 24 and the data selector 15 selects value one. The multiplier 20 thus performs a multiplying operation with respect to the values one and .SIGMA.X.sub.i.sup.2 so that the multiplied value .SIGMA.X.sub.i.sup.2 is transmitted to the data selector 17 and the adder-subtracter 21. The data selector 17 selects output data value .SIGMA.X.sub.i.sup.2 of the multiplier 20 by the control signal of the controller 24 and transmits this data value .SIGMA.X.sub.i.sup.2 to the register 18. Thus, the data value .SIGMA.X.sub.i.sup.2 is stored to the register 18. The adder-subtracter 21 performs predetermined adding and subtracting operations and the calculated results are transmitted to the register group 13. However, these calculated results are not inputted to the register group 13 by the control signal of the controller 24.

When the next clock signal is transmitted to the X-register 11 and the Y-register 12, similar to the above case, stored value .SIGMA.X.sub.i.sup.4 is transmitted from the .SIGMA.X.sub.i.sup.4 register 13d within the register group 13 to the data selector 14, etc. by the control signal of the controller 24. The data selector 14 selects output data value .SIGMA.X.sub.i.sup.4 of the .SIGMA.X.sub.i.sup.4 register 13d by the control signal of the controller 24. The data selector 15 selects data value .SIGMA.X.sub.i.sup.2 transmitted from the register 18 by the control signal of the controller 24. Thus, the multiplier 20 performs a multiplying operation with respect to the values .SIGMA.X.sub.i.sup.2 and .SIGMA.X.sub.i.sup.4 so that the multiplied data value .SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 is transmitted to the data selector 17 and the adder-subtracter 21. The adder-subtracter 21 performs a predetermined calculation and the calculated results are transmitted to the register group 13. However, these calculated results are not inputted to the register group 13 by the control signal of the controller 24. On the other hand, the data selector 17 selects the data value .SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 by the control signal of the controller 24 and transmits this value to the register 18. The register 18 stores this value .SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 by the control signal of the controller 24.

When the next clock signal is transmitted to the X-register 11 and the Y-register 12, similar to the above case, a stored counting value n is transmitted from the n-register 13h within the register group 13 to the data selector 14, etc. by the control signal of the controller 24. The data selector 14 selects output data of the n-register 13h by the control signal of the controller 24. The data selector 15 selects data value .SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 transmitted from the register 18 by the control signal of the controller 24. Thus, the multiplier 20 performs a multiplying operation with respect to the values n and .SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 so that the multiplied data value n.SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 is transmitted to the data selector 17 and the adder-subtracter 21. At this time, the data selector 16 selects numeral zero by the control signal of the controller 24 and transmits this numeral zero to the adder-subtracter 21. The adder-subtracter 21 adds this numeral zero to the value n.SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 and transmits the added value 4 n.SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 to the register group 13. The 4 register group 13 stores the transmitted value n.SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 to a work register 13i by the 4 control signal of the controller 24. On the other hand, the data selector 17 selects the data value n.SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 by the control signal of the controller 24 and transmits this value to the register 18. However, this value n.SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 is not inputted to the register 18 4 by the control signal of the controller 24.

The first term of the formula (6), n.SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 is calculated by the above-mentioned 4 operations and is stored to the work register 13i. Similarly, the second term of the formula (6), .SIGMA.X.sub.i .SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.3 is calculated and stored to the register 18. The data selector 14 selects output data of the register 18 by the control signal of the controller 24 and the data selector 15 selects numeral one. Thus, the multiplier 20 can transmit multiplied value .SIGMA.X.sub.i .SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.3 to the adder-subtracter 21. At this time, stored value n.SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 is read out of the work register 13i and the data selector 16 selects output data of the work register 13i, i.e., n.SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 by the control signal of the controller 24. The adder-subtracter 21 adds the value n.SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 to the value .SIGMA.X.sub.i .SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.3 and the added value n.SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.4 +.SIGMA.X.sub.i .SIGMA.X.sub.i.sup.2 .SIGMA.X.sub.i.sup.3 is stored to the work register 13i by the control signal of the controller 24.

The matrix A represented by the formula (6) is similarly calculated. The calculated matrix A is stored to a matrix-A register 13j by the control signal of the controller 24.

The matrix A constituting the denominators in the formulas (3), (4) and (5) is calculated by the above-mentioned operations. For example, a numerator in the formula (3) is calculated by using the respective values stored into the registers 13a to 13h within the register group 13 and performing operations similar to the above-mentioned operations with respect to these values. The calculated numerator is stored to the work register 13i by the control signal of the controller 24.

Thus, the denominator and numerator values required to calculate the coefficient .alpha. in the formula (3) have been obtained. The register group 13 transmits the stored values of the work register 13i and the matrix-A register 13j to the divider 22 by the control signal of the controller 24. The divider 22 divides the stored value of the work register 13i by the stored value of the matrix-A register 13j on the basis of the formula (3). Thus, the coefficient .alpha. is calculated and transmitted to the data selector 19. The data selector 19 selects and transmits this calculated coefficient .alpha. to the exterior of the statistical processor by the control signal of the controller 24.

The coefficients .beta. and .gamma. can be similarly calculated so that a regression curve can be obtained.

The operation of the statistical processor in this embodiment is operated as mentioned above. In this statistical processor, the values .SIGMA.X.sub.i, .SIGMA.X.sub.i.sup.2, .SIGMA.X.sub.i.sup.3, etc stored to the registers 13a to 13h within the register group 13 are calculated at the real time together with the input of sampling data. After these values have been calculated, the coefficients .alpha., .beta. and .gamma. can be calculated by processings having several ten steps at most. Accordingly, it is possible to perform a regression analysis at a high speed in comparison with that in the case of a general microprocessor in which processings having several hundred steps are required to calculate the above coefficients.

The regression curve is calculated in the above embodiment, but a regression straight line can be also calculated by providing coefficients .alpha. and .beta..

In accordance with the statistical processor in this embodiment, values .SIGMA.X.sub.i, .SIGMA.X.sub.i.sup.2, .SIGMA.X.sub.i.sup.3, etc are calculated every time when sampling data are supplied to the statistical processor. Accordingly, there is no limit with respect to the number of sampling data supplied to the statistical processor. Further, there is no case in which the operation of the statistical processor is stopped until all the sampling data are supplied to the statistical processor even when the number of sampling data is determined in advance. When no sampling data are supplied to the statistical processor or a predetermined number of sampling data have been completely supplied to the statistical processor, the results of coefficients .alpha., .beta., etc. provided by the above statistical calculations are outputted by transmitting a mode switching signal transmitted from an unillustrated computer for control to the controller 24 through the input terminal A and performing the above-mentioned control operation of the controller 24.

Further, in the statistical processor in this embodiment, the final results of the values .SIGMA.X.sub.i, .SIGMA.X.sub.i.sup.2, .SIGMA.X.sub.i.sup.3, etc. are stored to the respective registers without limiting a regression straight line and a regression curve. Accordingly, it is possible to calculate a sampling average by dividing the value .SIGMA.X.sub.i by positive integer n by the divider 22 and further perform the other statistical calculations such as a sampling distribution, etc. The statistical results calculated and outputted from the statistical processor are different from each other by transmitting the mode switching signal transmitted from the computer for control to the controller 24.

As mentioned above, in accordance with the present invention, a calculating section calculates and provides data such as an accumulated sum, etc. required to perform a statistical processing every time when sampling data are supplied to the statistical processor. These data are stored to the respective registers. Thus, the data required to perform a statistical processing are stored to the registers in advance and the calculating section for performing the statistical processing reads required data out of the registers by a control signal transmitted from a control section so as to calculate and provide desirable statistical results. Thus, it is possible to perform a statistical processing such as regression analysis at the real time.

Many widely different embodiments of the present invention may be constructed without departing from the spirit and scope of the present invention. It should be understood that the present invention is not limited to the specific embodiments described in the specification, except as defined in the appended claims.

Claims

1. A statistical processor for statistically processing at least two variable data sets each including a plurality of variable data values, said variable data values being applied sequentially to said processor during one or more predetermined periods, said processor comprising:

an arithmetic circuit for performing predetermined arithmetic operations on input data values applied thereto during one predetermined period and for obtaining operating result data;

a plurality of registers for storing said operating result data obtained by said arithmetic circuit, each of said plurality of registers storing respective operating result data obtained by said arithmetic circuit and being accessed when said respective operating result data is written thereto or read therefrom;

at least one data selector for selecting said input data values from at least two variable data values applied during one or more predetermined periods and said operating result data in said plurality of registers to supply said selected input data values to said arithmetic circuit; and

a controller for directly controlling a pipeline processing of said at least one data selector, said arithmetic circuit, and said plurality of registers.

2. A statistical processor as claimed in claim 1, wherein said pipeline processing is carried out until all data required to perform the statistical processing is obtained.

3. A statistical processor as claimed in claim 1, wherein said processor operates in a plurality of modes each adapted to perform a respective one of a plurality of statistical processings on said two variable data sets, and said controller includes a mode switching circuit, receiving an external mode switching signal, for controlling the pipeline processing to perform said respective one of said plurality of statistical processings.

4. A statistical processor as claimed in claim 1, further comprising a second plurality of registers for pre-storing therein data required to perform the statistical processing.