3
computes tests of normality on vector points.
7
The tests that <em>v.normal</em> performs are indexed
8
below. The tests that are performed are specified by
9
giving an index, ranges of indices, or multiple thereof.
12
<li> Sample skewness and kurtosis
13
<li> Geary's a-statistic and an approximate normal transformation
14
<li> Extreme normal deviates
15
<li> D'Agostino's D-statistic
16
<li> Modified Kuiper V-statistic
17
<li> Modified Watson U^2-statistic
18
<li> Durbin's Exact Test (modified Kolmogorov)
19
<li> Modified Anderson-Darling statistic
20
<li> Modified Cramer-Von Mises W^2-statistic
21
<li> Kolmogorov-Smirnov D-statistic (modified for normality testing)
22
<li> Chi-Square test statistic (equal probability classes) and
23
the number of degrees of freedom
24
<li> Shapiro-Wilk W Test
25
<li> Weisberg-Binghams W'' (similar to Shapiro-Francia's W')
26
<li> Royston's extension of W for large samples
27
<li> Kotz Separate-Families Test for Lognormality vs. Normality
32
<!-- do a meaningful example -->
33
Compute the sample skewness and kurtosis, Geary's
34
a-statistic and an approximate normal transformation,
35
extreme normal deviates, and Royston's W for the
36
<em>random</em> vector points:
38
<div class="code"><pre>
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g.region raster=elevation -p
41
v.db.addtable random colum="elev double precision"
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v.what.rast random rast=elevation column=elev
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v.normal random tests=1-3,14 column=elev
46
<!-- TODO: find references , e.g.
47
http://www.itl.nist.gov/div898/handbook/eda/section3/eda35.htm
53
<a href="v.univar.html">v.univar</a>
58
<a href="http://mccauley-usa.com/">James Darrell McCauley</a>
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<a href="mailto:darrell@mccauley-usa.com"><darrell@mccauley-usa.com></a>,
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<a href="https://engineering.purdue.edu/ABE/">Agricultural Engineering</a>
62
<a href="http://www.purdue.edu/">Purdue University</a>
64
<p><i>Last changed: $Date: 2014-12-19 22:55:37 +0100 (Fri, 19 Dec 2014) $</i>