Casio ClassPad 300 PLUS - Manual (Page 348)

20050501
Drawing a Linear Regression Graph
Linear regression uses the method of least squares to determine the equation that best fits
your data points, and returns values for the slope and
y -intercept. The graphic representation
of this relationship is a linear regression graph.
u ClassPad Operation
Start the graphing operation from the Statistics application’s Graph window or List window.
From the Graph window
Tap [Calc] [Linear Reg] [OK] [OK] ".
From the List window
Tap [SetGraph] [Setting…], or G.
On the Set StatGraphs dialog box that appears, configure a StatGraph setup with the
setting shown below, and then tap [Set].
Type: LinearR
Tap y to draw the graph.
7-5-5
Graphing Paired-Variable Statistical Data
The following is the linear regression model formula.
y = a ·x + b
a : regression coefficient (slope)
b : regression constant term ( y -intercept)
r : correlation coefficient
r 2 : coefficient of determination
MSe : mean square error
• MSe =
Σ 1
n – 2
i =1
n
(y
i
– (a·x
i
+ b)) 2