Drawing A Power Regression Graph ( Y = A·x B ) - Casio ClassPad 300 User Manual

Drawing a Power Regression Graph (
Power regression can be used when
regression formula is
b x
+ · ln( ). Next, if we say that X = ln(
the linear regression formula Y = A +
u ClassPad Operation
Start the graphing operation from the Statistics application's Graph window or List window.
From the Graph window
Tap [Calc] [Power 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: PowerR
Tap y to draw the graph.
The following is the power regression model formula.
y a x b
= ·
a
: regression coefficient
b
: regression power
r
: correlation coefficient
r 2
: coefficient of determination
MSe
: mean square error
• MSe =
n – 2
Graphing Paired-Variable Statistical Data
y
is proportional to the power of
b
y a x
= · . If we obtain the logarithms of both sides, we get ln(
x
), Y = ln(
b·
X.
n
1
Σ
(ln (y ) – (ln (a) + b·ln (x
i
i=1
7-5-12
b
y a x
= · )
y a
), and A = ln( ), the formula corresponds to
2
)))
i
20021201
x
. The normal power
y a
) = ln( )