K logarithmic regression graph, K exponential regression graph – Casio FX-CG10 User Manual
Page 211
6-18
k Logarithmic Regression Graph
Logarithmic regression expresses
y
as a logarithmic function of
x
. The standard logarithmic
regression formula is
y
=
a
+
b
× In
x
, so if we say that X = In
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 In
y
= In
a
+
bx
. Next, if we say Y = In
y
, and A = In
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