Casio fx-9860G AU PLUS, User Manual

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20050401
k k k k 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
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)
6 (DRAW)
The following is the linear regression model formula.
y
=
ax
+
b
a ............. regression coefficient (slope)
b
............. regression constant term (
y-
intercept)
r
............. correlation coefficient
r
2 ............ coefficient of determination
MSe ........ mean square error
k k k k k
Med-Med Graph
When it is suspected that there are a number of extreme values, a Med-Med graph can be
used in place of the least squares method. This is similar to linear regression, but it
minimizes the effects of extreme values.
1
(CALC)
3
(Med)
6 (DRAW)
The following is the Med-Med graph model formula.
y
=
ax
+
b
a .............
Med-Med graph slope
b ............. Med-Med graph y- intercept
6-3-6
Calculating and Graphing Paired-Variable Statistical Data
# Input a positive integer for frequency data.
Other types of values (decimals, etc.) cause
an error.