Casio ALGEBRA FX 2.0, User Manual

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19990401
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.
4
(CALC)
h
(Log)
6
(DRAW)
The following is the logarithmic regression model formula.
y
=
a
+
b
•
ln
x
a .............
regression constant term
b .............
regression coefficient
r ..............
correlation coefficient
r
2
............
coefficient of determination
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
.
4
(CALC)
i
(Exp)
6
(DRAW)
The following is the exponential regression model formula.
y
=
a
•
e bx
a .............
regression coefficient
b .............
regression constant term
r ..............
correlation coefficient
r
2
............ coefficient of determination
6-3-8
Calculating and Graphing Paired-Variable Statistical Data