HP 300s Scientific Calculator User 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
-------------------------
–
=