Casio fx-9750G Statistical Graphs and Calculations User Manual
Page 17
299
Quartic regression
a ......
Quartic regression coefficient
b ......
Cubic regression coefficient
c ......
Quadratic regression coefficient
d ......
Linear regression coefficient
e ......
Regression constant term (intercept)
k
k
k
k
k
Logarithmic Regression Graph
Logarithmic regression expresses
y
as a logarithmic function of
x
. The standard
logarithmic regression formula is
y
=
a
+
b
×
log
x
, so if we say that X = log
x
, the
formula corresponds to linear regression formula
y
=
a
+
b
X.
6
(
g
)
1
(Log)
6
(DRAW)
The following are the meanings of the above parameters.
a ......
Regression constant term (intercept)
b ......
Regression coefficient (slope)
r ......
Correlation coefficient
k
k
k
k
k
Exponential Regression Graph
Exponential regression expresses
y
as a proportion of the exponential function of
x
.
The standard exponential regression formula is
y
=
a
×
e
bx
, so if we take the loga-
rithms of both sides we get log
y
= log
a
+
bx
. Next, if we say Y = log
y
, and
a
= log
a
,
the formula corresponds to linear regression formula Y =
a
+
bx
.
6
(
g
)
2
(Exp)
1 2 3 4 5
6
1 2 3 4 5
6
Calculating and Graphing Paired-Variable Statistical Data
18 - 4
P.290
P.290