Micromeritics ASAP 2460 User Manual

ASAP 2460 Operator’s Manual Appendix C
246-42800-01 - Aug 2013 C-45
SPC Report Variables
Regression Chart Variables
The line of best fit for the Regression Chart is calculated by the usual Least Squares method. (Refer to
BASIC Scientific Subroutines Vol II, by F.R. Ruckdeschel, Copyright 1981 BYTE Publications/
McGraw Hill, p. 16.) If there is only a single point or all N points have the same x-value, there can be
no line of best fit in the standard form.
Slope =
The coefficient of Correlation for this line is also calculated in the usual way. (Refer to Mathematical
Handbook for Scientists and Engineers, by Granino A. Korn and Theresa M. Korn, Copyright 1961,
1968 McGraw Hill, Sec. 18.4.)
Correlation Coefficient =
X
 x
i
N
---------
=
Y
 y
i
N
---------
=
 x
i
X–y
i
Y–
 x
i
X–
2
-------------------------------------------

x
 x
i
X–
2
N
--------------------------=

y
 y
i
Y–
2
N
--------------------------=
Cov x y
 x
i
X–y
i
Y–
N
-------------------------------------------
=
Cov x y

x

y
-----------------------

Micromeritics ASAP 2460 Specifications

General

Brand	Micromeritics
Model	ASAP 2460
Category	Measuring Instruments
Language	English