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Drawing a linear regression graph -5-5, Drawing a linear regression graph – Casio ClassPad 300 PLUS User Manual

Page 348

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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