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Drawing a Power Regre
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 +
Cla
Pad 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 Li t window
Tap [SetGraph][Setting...], or
On the Set StatGraphs dialog box that appears, configure a StatGraph setup with the
setting shown below, and then tap [Set].
Type: PowerR
Tap
to draw the graph.
The following is the power regression model formula.
b
y
a
x
=
·
a
:
regression coefficient
b
:
regression power
r
:
correlation coefficient
2
r
:
coefficient of determination
MSe
: mean square error
1
• MSe =
n – 2
7-5-12
Graphing Paired-Variable Statistical Data
ion Graph (
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
(ln (y
) – (ln (a) + b·ln (x
i
i=1
20060301
b
y
a
x
=
·
)
y
a
), and A = ln(
), the formula corresponds to
2
)))
i
x
. The normal power
y
a
) = ln(
)
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