2
1.Modifications Made to ALGEBRA 2.0 by STAT2
u
u
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u
u
Changes to the Function Menu
Installing STAT2 changes the function menu of the STAT Mode list input screen (initial
screen) as shown below.
Pressing a function key that corresponds to the added item displays a menu that lets you
select one of the functions listed below.
•
3
(TEST) ... Test (Chapter 2, page 6)
•
4
(INTR) ... Confidence interval (Chapter 3, page 31)
•
5
(DIST) ... Distribution (Chapter 4, page 42)
The SORT and JUMP functions available with ALGEBRA FX2.0 are moved to the TOOL
menu (
6
and
1
) by STAT2.
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Calculation of the Coefficient of Determination (r
2
) and MSE
STAT2 adds calculation of the coefficient of determination (r
2
) for quadratic regression, cubic
regression, and quartic regression. The following types of MSE calculations are also added
for each type of regression.
• Linear Regression ...
MSE
=
!
1
n
–
2
i
=1
n
(
y
i
–
(
ax
i
+
b
))
2
•
Quadratic Regression ...
MSE
=
!
1
n
–
3
i
=1
n
(
y
i
–
(
ax
i
+
bx
i
+
c
))
2
2
•
Cubic Regression ...
MSE
=
!
1
n
–
4
i
=1
n
(
y
i
–
(
ax
i
3
+
bx
i
+
cx
i
+
d
))
2
2
•
Quartic Regression ...
MSE
=
!
1
n
–
5
i
=1
n
(
y
i
–
(
ax
i
4
+
bx
i
3
+
cx
i
+
dx
i
+
e
))
2
2
•
Logarithmic Regression ...
MSE
=
!
1
n
–
2
i
=1
n
(
y
i
–
(
a
+
b
ln
x
i
))
2
