HP 300s - Page 62

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= A + Bx + Cx
2
Reg Sub-menu (  (STAT)  (Reg))
Sum sub-menu (sums), Var sum-menu (number of samples,
mean, standard deviation), and MinMax sub-menu (maximum
value, minimum value) operations are the same those for
linear regression calculations.
Quadratic Regression Calculation
For example:
All the data used as the following table:
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

Estimated value of x1

Estimated value of x2

Estimated value of y
xy xy
1.0 1.0 2.1 1.5
1.2 1.1 2.4 1.6
1.5 1.2 2.5 1.7
1.6 1.3 2.7 1.8
1.9 1.4 3.0 2.0
Sx
2
x
2
x

4
x
2

()
2
n
------------------–=
Sx
2
yx
2
y

x
2
y

•

n
-------------------------–=
x
ˆ
1
B– B
2
4CA y–()–+
2C
--------------------------------------------------------=
x
ˆ
2
B– B
2
4CA y–()––
2C
--------------------------------------------------------=
y
ˆ
x
ˆ
1
x
ˆ
2
y
ˆ