JPH0612377A - Small-sized electronic computer with process capacity index calculating function - Google Patents

Abstract

PURPOSE:To easily find a process capacity index by displaying the mean value and standard deviation of a statistical graph as reference lines in the graph and also displaying a standard value as a reference line while displaying the statistical graph on a screen. CONSTITUTION:A CPU 1 displays an input screen of the standard value to prompt the input of a standard upper-limit value and a standard lower-limit value, displays a menu screen again once the standard upper-limit value and standard lower-limit value are inputted, and continues to display the menu screen. When the calculation and display of the process capacity index are selected on the menu screen, the CPU 1 calculates the process capacity index by using the inputted standard upper-limit value and standard lower-limit value, and the mean value and standard deviation of statistical data and displays the calculation result on an LCD display 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small computer, and more particularly to a small computer with a process capability index calculation function.

[0002]

2. Description of the Related Art Conventionally, even if a statistical graph is displayed on the screen, the average value and standard deviation of the statistical graph are not displayed, and the distribution tendency of statistical data cannot be determined. Furthermore, especially with a small-sized electronic computer, it was not possible to quickly calculate the process capability index for addition / deletion of statistical data. Therefore, in order to obtain the process capability index, it is necessary to obtain the statistic amount (average value / standard deviation) of the target statistical data group and manually calculate the process capability index based on the standard value determined by the user. there were. Therefore, recalculation at the time of data addition / deletion / change was very time-consuming.

[0003]

As described above, in the past, even if the statistical graph was displayed on the screen, the average value and standard deviation thereof were not displayed, and the distribution tendency of the statistical data could not be determined. With a small computer, the process capability index could not be calculated quickly, so it was necessary to manually calculate the process capability index for the addition / deletion of statistical data. Therefore, there is a drawback that recalculation is very time-consuming when adding / deleting / changing data.

[0004]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above problems. In the invention of claim 1, the statistical graph mode is selected in a small electronic calculator with a process capability index calculating function. And a selecting means for selecting the processing of the statistical graph, a displaying means for displaying a histogram of the selected statistical graph when the statistical graph mode is selected by the selecting means, and a reference of the statistical graph in response to the selecting means. Flag means for indicating whether or not a line is overwritten on the histogram, and in response to the selecting means, a standard upper limit value, a standard lower limit value, an average value of statistical data,
Detection means for detecting whether or not to calculate the process capability index based on the standard deviation, and in response to the outputs of the flag means and the detection means, the processing of the statistical graph is operated to calculate the reference line of the statistical graph with the histogram. And a calculation processing means for calculating the process capability index, and in response to the calculation processing means, the display means overwrites and displays the reference line of the statistical graph on the histogram. It is a small electronic calculator with a process capability index calculation function for displaying the process capability index.

According to a second aspect of the present invention, the selecting means performs processing for indicating whether or not the reference line of the statistical graph is overwritten on the histogram, and the standard upper limit value of the statistical data.
It is a small computer with a process capability index calculation function that selects on the display screen a process for inputting a standard lower limit value, an average value, a standard deviation and a process for instructing whether or not to calculate a process capability index.

[0006]

With the above configuration, the statistical graph is displayed on the screen, and at the same time, the average value and standard deviation thereof are also displayed as a reference line on the graph. Further, the standard value, which is the value intended by the user, is also displayed by the reference line.

More specifically, in order to obtain the process capability index, the statistic amount (average value / standard deviation) of the statistical data group that has already been obtained is used and based on the standard value input in advance. , Automatically obtain the process capability index.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A compact electronic computer according to the present invention will be described in detail below based on the embodiments of the present invention shown in the drawings.
Needless to say, the present invention is not limited to these embodiments.

FIG. 1 is an external view of a scientific calculator as a small electronic calculator with a process capability index calculation function according to an embodiment of the present invention, FIG. 2 is a system block diagram of the scientific calculator according to the present invention, and FIG. 3 is a process according to the present invention. FIG. 4 is a flow chart of the capability index calculation step, and FIG. 4 is a menu screen of the small-sized computer of the present invention, which is a screen for inputting and displaying the standard upper limit value and the standard lower limit value, and selecting to calculate the process capability index.
5 is an input screen for inputting the standard upper limit value / standard lower limit value selected in FIG. 4, FIG. 6 is a display example of a histogram displayed when the statistical graph mode is selected according to the present invention, and FIG. Example of display screen when the user selects to overwrite the standard upper limit value, standard lower limit value and average value with the histogram, and FIG. 8 shows the process capability index calculation selected in the menu of FIG. The example of a display screen which displayed the displayed process capability index value is shown respectively.

In FIG. 1, the scientific calculator according to the present invention is composed of an input section and a display section.
It has a mode key for selecting the mode of CALC mode, GRAPH mode, PROGRAM mode, and STAT mode, and a 2nd function key for operating the key as a key symbol above the key or on the upper left side of the key. The function key is pressed before the target key is pressed. If the mode key is selected after pressing the second function key, the CALC
The mode key functions as a SOLVER mode key, and the STAT mode key functions as a STAT GRAPH mode key.
Further, the input unit includes a numerical key for inputting a numerical value, an ON / OFF key for turning on / off the power source, a cursor key for instructing movement of a cursor at the time of data editing, data feeding during data display, and the like. Function key,
It has four arithmetic operation keys, an input key for instructing data registration and selection on a menu screen, and an execution key.

Referring to FIG. 2, the system according to the present invention includes a CPU 1 for controlling a computer and process capability indexes (Cp, Cp).
k) which is a calculation formula (Cp is a process capability index formula in the case of a two-sided standard, Cpk is a process capability index formula in the case of a one-sided standard), a histogram format for drawing a histogram of a statistical graph, and a process A read-only storage device ROM2 that has a menu format for the user to select the calculation of the capability index, and a writable that stores the following numerical values and flags for performing graph drawing / calculation Storage device RAM3 and LC
LCD driver 4 that controls the drive of D, LCD display 5 that displays, and K that detects key input.
It consists of EY6.

[0012]

[Equation 1]

Storage contents of ROM 2 Storage area Sd for storing statistical data group Average value x of stored statistical data Standard deviation value σ of stored statistical data Numerical value input by user (upper limit of standard) Value / standard lower limit value) storage area U. L. (Standard upper limit value) and L. L.
(Lower limit of standard) The x-bar, U.S.
L. L.,. L. Limit Flag indicating whether or not to overwrite the reference line of the CPU 1. If there is an instruction by a key input, the CPU 1 is based on the format of the histogram of the statistical graph in the ROM 2,
The statistical data stored in AM3 is displayed on the LCD display 5 or the process capability index is obtained.

For the calculation of the present invention, it is necessary to register the statistical data in advance so that the average value and the like can be obtained. Therefore, in this embodiment, by selecting the statistical data input mode in advance, 9 pieces of statistical data 1,
It is assumed that 2, 3, 4, 5, 2, 3, 4, 3 are registered.

In this state, when the 2nd function key and then the statistical graph mode key of the mode key are pressed,
The statistical graph mode will be selected.

FIG. 3 is a flowchart showing the process index calculation step of the present invention. When the statistics graph mode is selected, the CPU looks at the Limit Flag on the RAM, and if the Limit Flag = 0, the registered statistical data is totaled and the display screen histogram is displayed as shown in FIG. To do.

At this time, if the Limit Flag = 1, the CPU displays the reference line of the standard value and the average value together with the statistical graph (FIG. 7). When the menu key is pressed at the time of displaying the statistical graph, the menu is selected, and the specification upper limit value / standard lower limit value input, reference line display / non-display, process capability index calculation, etc. can be selected (FIG. 4). The function displayed on the menu screen of FIG. 4 is "REG".
Is a regression coefficient calculation of statistical data, "SCALE" is a display switch of the actual value /% value of the vertical axis scale of the statistical graph, "LIMIT SET" is an input of standard upper limit value / standard lower limit value, "LIMIT ON" is the simultaneous drawing of the reference line of the average value, the standard upper limit value, and the standard lower limit value, "LIMIT OFF" is the cancellation of the reference line display, and "CP" is the process capability index ( Process C
calculation and display of "ability", and also "OM
"EGA" is a calculation function of an omega variable function.

The character reverse display of the menu screen shown in FIG. 4 indicates that "LIMIT SET" is selected.

As shown in FIG. 4, when "LIMIT SET" is selected on the menu screen, the CPU
1 displays the standard value input screen of FIG. 5 and prompts the user to input the standard upper limit value and the standard lower limit value.

When the standard upper limit value and the standard lower limit value are input, the menu screen of FIG. 4 is displayed again. Here, "LIMIT
When "ON" is selected, the CPU 1 sets the Limit
Set Flag to 1 and continue displaying the menu screen (FIG. 4). When "LIMIT OFF" is selected, the CPU 1 sets 0 for the Limit Flag and continues displaying the menu screen (FIG. 4).

In the menu screen of FIG. 4, "C.
P. Process Capability Index (ProcessCapability)
If the calculation and display of the (typity) is selected, the CPU 1 uses the standard upper limit value, the standard lower limit value, and the average value and the standard deviation of the statistical data input by the user,
After calculating the process capability indexes Cp and Cpk, the calculation result is displayed on the LCD display 5 according to the format of FIG. After that, the CPU 1 continues this display until the "QUIT" key is pressed, and when the "QUIT" key is pressed, the display returns to the menu screen display (FIG. 4).

When the "QUIT" key is pressed while the menu screen is displayed, the CPU 1 ends the display of the menu screen and restarts the statistical graph display. At this time, CPU1
Refers to the value of Limit Flag, and selects whether to display only the histogram (FIG. 6) or simultaneously display the histogram and various reference lines (FIG. 7).

As described above, the present invention provides a statistical graph display function that integrates the statistical graph with various reference lines (FIG. 7) and the process capability index calculation function (FIG. 8).

Besides, the present invention is not limited to the embodiments described above and shown in the drawings, and it is needless to say that the present invention can be appropriately modified and implemented without departing from the scope of the invention.

[0025]

The statistical graph is displayed on the screen, and at the same time, the average value and standard deviation thereof are also displayed as a reference line on the graph, so that the distribution tendency of statistical data can be easily grasped. or,
Since the standard value, which is the target value for the user, is also displayed by the reference line, the characteristics of the statistical data can be easily evaluated.

More specifically, in order to obtain the process capability index, the statistical amount (average value / standard deviation) of the statistical data group that has already been obtained is used, and based on the standard value input in advance. Since the process capability index is automatically determined, the process capability index can be easily determined even when data is added / deleted / changed and the standard value is changed.

[Brief description of drawings]

FIG. 1 is an external view of a small-sized computer having a process capability index calculation function according to the present invention.

FIG. 2 is a system block diagram of a small-sized computer having a process capability index calculation function according to the present invention.

FIG. 3 is a flowchart showing a process capability index calculation step according to the present invention.

FIG. 4 is a menu screen of the small-sized computer of the present invention.

5 is an input screen for inputting a value selected on the menu screen of FIG.

FIG. 6 is a display example of a histogram displayed when a statistical graph mode is selected according to the present invention.

FIG. 7 is an example of a display screen when the user selects to overwrite the standard upper limit value, standard lower limit value, and average value with the histogram according to the present invention.

8 is an example of a display screen that displays a process capability index value that is displayed when calculation of a process capability index is selected on the menu screen of FIG.

[Explanation of symbols] Mode key 2nd function key Numerical key ON / OFF key Cursor key Function key Four arithmetic operation keys Input / execute key Display 1 CPU 2 ROM 3 RAM 4 LCD driver 5 LCD 6 KEY

Claims (2)

[Claims] 1. A small electronic computer with a process capability index calculation function, which is selected when a statistical graph mode is selected and a statistical graph process is selected; and when the statistical graph mode is selected by the selecting unit. Display means for displaying the histogram of the statistical graph, flag means for responding to the selecting means and indicating whether or not to overwrite the reference line of the statistical graph on the histogram, and for responding to the selecting means, the standard upper limit of statistical data Value, standard lower limit value, average value, by standard deviation, detection means for detecting whether to calculate the process capability index, in response to the output of the flag means and the detection means,
And a calculation processing unit that calculates the process capability index by operating the process of the statistical graph to overwrite the reference line of the statistical graph on the histogram, and in response to the calculation processing unit, the display unit is the A small electronic calculator with a process capability index calculation function, wherein a reference line of a statistical graph is overwritten and displayed on the histogram and the process capability index is displayed. 2. The selecting means includes processing for indicating whether or not a reference line of a statistical graph is overwritten on the histogram, and processing for inputting a standard upper limit value, a standard lower limit value, an average value, and a standard deviation of statistical data. The small computer with a process capability index calculating function according to claim 1, wherein a process for instructing whether or not to calculate the process capability index is selected on the display screen.