Results:
Commands when Quadratic Regression Calculation (_+CX
2
) Is
Selected
Reg Sub-menu (
(STAT)
(Reg))
Select this menu
item:
When you want to obtain this:
(A)
Regression coefficient constant term A
(B)
Linear coefficient B of the regression
coefficients
(C)
Quadratic coefficient C of the regression
coefficients
(
x
ˆ
1
)
Estimated value of
x
1
(
x
ˆ
2
)
Estimated value of
x
2
(
y
ˆ)
Estimated value of
y
Note
•
x
ˆ,
x
ˆ
1
,
x
ˆ
2
and
y
ˆ are not variables. They are commands of the type that take an
argument immediately before them. See "Calculating Estimated Values" for more
information.
Example 2:
To input the single-variable data
x
= {1, 2, 2, 3, 3, 3, 4, 4,
5}, using the FREQ column to specify the number of repeats for each
items ({
x
n
; freq
n
} = {1;1, 2;2, 3;3, 4;2, 5;1}), and calculate the mean and
population standard deviation.
(SETUP)
(STAT)
(ON)
(STAT)
(1-VAR)
1
2
3
4
5
1
2
3
2
(STAT)
(Var)
(
x
)
3
(STAT)
(Var)
(σ
x
)
1.154700538
Mean: 3, Population Standard Deviation: 1.154700538
Example 3:
To calculate the linear regression and logarithmic regression
correlation coefficients for the following paired-variable data and determine
the regression formula for the strongest correlation: (
x
,
y
) = (20, 3150),
49
