Displaying Regression Calculation Results; Graphing Statistical Calculation Results; Linear Regression Graph - Casio FX-CG20 AU User Manual

k Displaying Regression Calculation Results
Whenever you perform a regression calculation, the regression formula parameter (such
a b
as and in the linear regression
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
r 2
............. coefficient of determination (except for Med-Med, sinusoidal regression, and
MSe
......... mean square error (except for Med-Med)
k Graphing Statistical Calculation Results
While the parameter calculation result is on the display, you can graph the displayed
regression formula by pressing 6(DRAW).
k 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
x
when = 0) of the line.
The graphic representation of this relationship is a linear regression graph.
The following is the linear regression model formula.
y ax b
= +
a
............. regression coefficient (slope)
b
............. regression constant term (
y a bx
= +
a
............. regression constant term (
b
............. regression coefficient (slope)
y
=
regression, and power regression only)
logistic regression)
1(CALC) 2(X)
1( ) or 2(
ax b a bx
+ +
6(DRAW)
ax b
+ ) calculation results appear on the display. The
)
y
-intercept)
y
-intercept)
6-17
y y
-intercept ( -coordinate