Kk power regression graph, Kk sinusoidal regression graph – Casio ALGEBRA FX 2.0 Statistical Graphs and Calculations User Manual
Page 18
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k
k
k
k
k Power Regression Graph
Power regression expresses
y
as a proportion of the power of
x
. The standard power
regression formula is
y
=
a
×
x
b
, so if we take the logarithms of both sides we get In
y
= In
a
+
b
× In
x
. Next, if we say X = In
x
, Y = In
y
, and
a
= In
a
, the formula corresponds to linear
regression formula Y =
a
+
b
X.
4(CALC)j(Power)
6(DRAW)
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
k
k
k
k
k Sinusoidal Regression Graph
Sinusoidal regression is best applied for cyclical data.
The following is the sinusoidal regression model formula.
y
=
a
·sin(
bx
+
c
) +
d
While the statistical data list is on the display, perform the following key operation.
4(CALC)v(Sin)
6(DRAW)
Drawing a sinusoidal regression graph causes the angle unit setting of the calculator to
automatically change to Rad (radians). The angle unit does not change when you perform a
sinusoidal regression calculation without drawing a graph.
• Certain types of data may take a long time to calculate. This does not indicate malfunction.
6-3-9
Calculating and Graphing Paired-Variable Statistical Data