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E-80
A
Performing a Specifi c Regression Calculation
Example: To use the statistical data shown below to perform logarithmic regression to
obtain the correlation coeffi cient and the estimated value of
y
when
x
= 100
x y
29 1.6
50 23.5
74 38.0
103 46.4
118 48.9
1. Display the logarithmic regression calculation result screen.
z
6
(RESULT)
2
(Reg)
3
(Log)
2. Press
J
to return to the STAT editor screen.
3. Press
z
1
(
/
COMP) to display the COMP Mode calculation screen.
4. Determine correlation coeffi cient r and the estimated value of
y
when
x
= 100.
• Correlation Coeffi cient
z
7
(STAT)
2
(VAR)
ccc
4
(r)
E
• Estimated Value of
y
when
x
= 100
100
z
7
(STAT)
2
(VAR)
ccc
7
(
n
)
E
Note
• The r and
n
values produced by this example are for logarithmic regression because
we fi rst displayed the logarithmic regression calculation screen in step 1 before using
the commands to calculate the values were wanted. If you do not display a particular
regression calculation result screen fi rst, the values produced by the commands are for
linear regression by default.
• For details about statistical calculation commands, see “REG Mode Statistical Command
Reference” (page 80).
A
REG Mode Statistical Command Reference
Mean and Standard Deviation Commands
n
z
7
(STAT)
2
(VAR)
1
Obtains the number of samples.
n
= (number of
x
i
-data items)