Chapter 7 statistical graphs and calculations – Casio fx-7400G PLUS Statistical Graphs and Calculations User Manual
Page 22
116
Chapter 7
Statistical Graphs and Calculations
The following are the meanings of the above parameters.
a ......
Regression second coefficient
b ......
Regression first coefficient
c ......
Regression constant term (
y
-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.
[1(Log)
4(DRAW)
The following are the meanings of the above parameters.
a ......
Regression constant term
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
.
[2(Exp)
P.106
1
2
3
4
1
2
3
4
P.106