NAME
s.normal - tests for normality for sites.
(GRASS Sites Program)
SYNOPSIS
s.normal
s.normal help
s.normal [-q] input=name
[tests=range[,range,...]]
DESCRIPTION
s.normal
computes tests of normality on a site list.
OPTIONS
Flag:
- -q
- Quiet. Cut out the chatter when reading site list.
Parameters:
- input=name
- Name of sites list.
- tests=range[,range,...]]
- Tests of normality requested (see below).
NOTES
The tests that s.normal performs are indexed
below. The tests that are performed are specified by
giving an index, ranges of indices, or multiple thereof.
- Sample skewness and kurtosis
- Geary's a-statistic and an approximate normal transformation
- Extreme normal deviates
- D'Agostino's D-statistic
- Modified Kuiper V-statistic
- Modified Watson U^2-statistic
- Durbin's Exact Test (modified Kolmogorov)
- Modified Anderson-Darling statistic
- Modified Cramer-Von Mises W^2-statistic
- Kolmogorov-Smirnov D-statistic (modified for normality testing)
- Chi-Square test statistic (equal probability classes) and
the number of degrees of freedom
- Shapiro-Wilk W Test
- Weisberg-Binghams W'' (similar to Shapiro-Francia's W')
- Royston's extension of W for large samples
- Kotz Separate-Families Test for Lognormality vs. Normality
EXAMPLE
- s.normal input=soils tests=1-3,14
computes the sample skewness and kurtosis, Geary's
a-statistic and an approximate normal transformation,
extreme normal deviates, and Royston's W for the
soils site list.
SEE ALSO
s.univar
BUGS
Please send all bug fixes and comments to the author
or the grass development team.
http://www.geog.uni-hannover.de/grass/
AUTHOR
James Darrell McCauley
<darrell@mccauley-usa.com>,
when he was at:
Agricultural
Engineering
Purdue University