Casio CFX-9850G PLUS, User'S Manual & Technical Reference

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264
18 - 4
Calculating and Graphing Paired-Variable Statistical Data
k k
k k
k
Power Regression Graph
P.254 Exponential 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.
6
(
g
)
3
(Pwr)
1 2 3 4 5
6
6
(DRAW)
a ......
regression coefficient
b ......
regression power
r ......
correlation coefficient
r
2
..... coefficient of determination
k k
k k
k
Sine Regression Graph
Sine regression is best applied for phenomena that repeats within a specific
range, such as tidal movements.
y
=
a
·sin(
bx
+
c
) +
d
While the statistical data list is on the display, perform the following key operation.
6
(
g
)
5
(Sin)
6
(DRAW)
Drawing a sine 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 sine regression calculation without drawing a graph.
P.254
6