Casio fx-9860G AU PLUS, User Manual

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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 logarithm 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.
1
(CALC)
6
(
g
)
4
(Pwr)
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
MSe
........ mean square error
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.
1
(CALC)
6
( g )
5
(Sin)
6 (DRAW)
Make sure that the angle unit setting of the calculator is Rad (radians) when drawing a
sinusoidal regression graph. The sinusoidal regression calculation is performed using
radians, so the graph will cannot be drawn correctly if the angle unit setting is something
else.
• 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
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