Casio FX-CG10, Руководство пользователя

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6-17
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Displaying Regression Calculation Results
Whenever you perform a regression calculation, the regression formula parameter (such
as
a
and
b
in the linear regression
y
=
ax
+
b
) calculation results appear on the display. The
regression formula parameter calculation results also appear as soon as you press
1
(CALC)
and then a function key to select a regression type, while a graph is on the display.
The following parameters will also appear on the regression calculation result screen.
r
.............. correlation coefficient (linear regression, logarithmic regression, exponential
regression, and power regression only)
r
2 ............. coefficient of determination (except for Med-Med, sinusoidal regression, and
logistic regression)
MSe
......... mean square error (except for Med-Med)
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Graphing Statistical Calculation Results
While the parameter calculation result is on the display, you can graph the displayed
regression formula by pressing
6
(DRAW).
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Linear Regression Graph
Linear regression uses the method of least squares to plot a straight line that passes close to
as many data points as possible, and returns values for the slope and
y
-intercept (
y
-coordinate
when
x
= 0) of the line.
The graphic representation of this relationship is a linear regression graph.
1
(CALC)
2
(X)
1
(
ax
+
b
) or
2
(
a
+
bx
)
6
(DRAW)
The following is the linear regression model formula.
y
=
ax
+
b
a
............. regression coefficient (slope)
b
............. regression constant term (
y
-intercept)
y
=
a
+
bx
a
............. regression constant term (
y
-intercept)
b
............. regression coefficient (slope)