HP 300s Scientific Calculator - Manual (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:
xˆ
yˆ
xˆ
yˆ
A
y 
n
-------- B
x 
n
--------
 
 
 
– C
x
2 
n
-----------
 
 
 
– =
B
Sxy Sx
2
x
2
Sx
2
y Sxx
2 • – •
Sxx Sx 2
x
2
Sxx
2 ( )
2
– •
----------------------------------------------------------------- =
C
Sx 2 y Sxx Sxy Sxx 2 • – •
Sxx Sx
2
x
2
Sxx
2 ( )
2
– •
----------------------------------------------------------- =
Sxx x  2
x  ( )
2
n
---------------- – =
Sxy xy 
x y  • 
n
----------------------- – =
Sxx
2
x 
3
x x 2  • 
n
------------------------- – =