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Performing Paired-variable Statistical Calculations
To perform the example operations in this section, fi rst select REG (
N
5
) as the
calculation mode.
A
Regression Calculation Types
The REG Mode lets you perform the seven types of regression listed below. The fi gures in
the parentheses show the theoretical formulas.
• Linear (
y
=
a
+
bx
)
• Quadratic (
y
=
a
+
bx
+
cx
2
)
• Logarithmic (
y
=
a
+
b
ln
x
)
•
e
Exponential (
y
=
ae
bx
)
•
ab
Exponential (
y
=
ab
x
)
• Power (
y
=
ax
b
)
• Inverse (
y
=
a
+
b
/
x
)
Each time you enter the REG Mode, you must select the type of regression calculation you
plan to perform.
Selecting the Regression Calculation Type
1. Press
N
5
(REG) to enter the REG Mode.
• This displays the initial regression calculation selection menu. The menu has two
screens, and you can use
d
and
e
to navigate between them.
Lin Lo
g
Ex
p
P
w
r
1234
Inv Quad AB
–
Ex
p
12 3
2. Perform one of the following operations to select the regression calculation you want.
To select this regression type: And press this key:
Linear
1
(Lin)
Logarithmic
2
(Log)
e
Exponential
3
(Exp)
Power
4
(Pwr)
Inverse
e
1
(Inv)
Quadratic
e
2
(Quad)
ab
Exponential
e
3
(AB-Exp)
Note
You can switch to another regression calculation type from within the REG Mode, if you
want. Pressing
1
2
(S-VAR)
3
(TYPE) will display a menu screen like the one shown in
step 1 above. Perform the same operation as the above procedure to select the regression
calculation type you want.