Casio FX-7400GII - SOFTWARE VERSION 2-00 User Manual page 152

Quadratic regression
Model formula.......
a
.......... regression second coefficient
b
.......... regression first coefficient
c
.......... regression constant term
y
( -intercept)
Quartic regression
Model formula.......
a
.......... regression fourth coefficient
b
.......... regression third coefficient
c
.......... regression second coefficient
d
.......... regression first coefficient
e
.......... regression constant term (
Logarithmic Regression Graph
Logarithmic regression expresses
regression formula is
linear regression formula
The following is the logarithmic regression model formula.
y a b x
= + ·ln
a
.............. regression constant term
b
.............. regression coefficient
Exponential Regression Graph
Exponential regression expresses
standard exponential regression formula is
y
sides we get In = In
linear regression formula Y = A +
The following is the exponential regression model formula.
bx
y a e
= ·
a
.............. regression coefficient
b
.............. regression constant term
x
y a b
= ·
a
.............. regression constant term
b
.............. regression coefficient
y ax bx c
= 2 + +
y ax bx cx
= 4 + 3 + 2 +
y
-intercept)
y
as a logarithmic function of
y a b x
= + × In , so if we say that X = In
y a b
= + X.
(CALC) ( ) (Log)
(DRAW)
y
as a proportion of the exponential function of
a bx
+ . Next, if we say Y = In
bx
.
(CALC) ( ) (Exp)
aeˆbx abˆx
( ) or ( )
(DRAW)
Cubic regression
Model formula.......
a
.......... regression third coefficient
b
.......... regression second coefficient
c
.......... regression first coefficient
d
.......... regression constant term
y
( -intercept)
dx e
+
x
, the formula corresponds to
bx
y a e
= × , so if we take the logarithms of both
y
, and A = In
6-12
y ax bx cx
= 3 + 2 +
x
. The standard logarithmic
x
. The
a
, the formula corresponds to
d
+