Casio FX-CG10, User Manual

Page: 221 / 608

6-19
k
Logarithmic Regression Graph
Logarithmic regression expresses
y
as a logarithmic function of
x
. The standard logarithmic
regression formula is
y
=
a
+
b
× ln
x
, so if we say that X = ln
x
, the formula corresponds to
linear regression formula
y
=
a
+
b
X.
1
(CALC)
6
( g )
2
(Log)
6
(DRAW)
The following is the logarithmic regression model formula.
y
=
a
+
b
·ln
x
a
.............. regression constant term
b
.............. regression coefficient
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 logarithms of both
sides we get ln
y
= ln
a
+
bx
. Next, if we say Y = ln
y
, and A = ln
a
, the formula corresponds to
linear regression formula Y = A +
bx
.
1
(CALC)
6
(
g
)
3
(EXP)
1
( ae bx ) or
2
( ab x )
6
(DRAW)
The following is the exponential regression model formula.
y
=
a
·
e
bx
a
.............. regression coefficient
b
.............. regression constant term
y
=
a
·
b
x
a
.............. regression constant term
b
.............. regression coefficient