HP 300s - Page 61

55
  (STAT)  (Reg)
 (B) 
 (STAT)  (Reg)  (r) 
*    (STAT)  (Reg)
 () 
**    (STAT)  (Reg)
 () 
* Estimated Value (y = 3 → = ?)
** Estimated Value (x = 2
→ = ?)
Commands when Quadratic Regression
Calculation (_+CX) Is Selected
With quadratic regression, regression is performed in
accordance with the following model equation.
y = A + BX + CX
2
For example:
x
ˆ
y
ˆ
x
ˆ
y
ˆ
A
y

n
-------- B
x

n
--------



– C
x
2

n
-----------



–=
B
Sxy Sx
2
x
2
Sx
2
ySxx
2
•–•
Sxx Sx
2
x
2
Sxx
2
()
2
–•
-----------------------------------------------------------------=
C
Sx
2
ySxxSxySxx
2
•–•
Sxx Sx
2
x
2
Sxx
2
()
2
–•
-----------------------------------------------------------=
Sxx x

2
x

()
2
n
----------------–=
Sxy xy

xy

•

n
-----------------------–=
Sxx
2
x

3
xx
2

•

n
-------------------------–=