v.normal(1)

1v.normal(1)                   Grass User's Manual                  v.normal(1)
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NAME

6       v.normal  - Tests for normality for points.
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KEYWORDS

9       vector, statistics
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SYNOPSIS

12       v.normal
13       v.normal help
14       v.normal [-rql] map=string tests=range[,range,...] column=string
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16   Flags:
17       -r  Use only points in current region
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19       -q  Quiet
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21       -l  lognormal
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23   Parameters:
24       map=string
25           point vector defining sample points
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27       tests=range[,range,...]
28           Lists of tests (1-15): e.g. 1,3-8,13
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30       column=string
31           Attribute column
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DESCRIPTION

34       v.normal computes tests of normality on vector points.
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NOTES

37       The tests that v.normal performs are indexed below.  The tests that are
38       performed are specified by giving an index, ranges of indices, or  mul‐
39       tiple thereof.  Sample skewness and kurtosis Geary's a-statistic and an
40       approximate normal transformation Extreme normal deviates  D'Agostino's
41       D-statistic  Modified  Kuiper V-statistic Modified Watson U^2-statistic
42       Durbin's Exact Test  (modified  Kolmogorov)  Modified  Anderson-Darling
43       statistic Modified Cramer-Von Mises W^2-statistic Kolmogorov-Smirnov D-
44       statistic (modified for normality testing)  Chi-Square  test  statistic
45       (equal  probability  classes)  and  the  number  of  degrees of freedom
46       Shapiro-Wilk W Test Weisberg-Binghams W'' (similar to Shapiro-Francia's
47       W')  Royston's  extension of W for large samples Kotz Separate-Families
48       Test for Lognormality vs. Normality
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EXAMPLE

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52       v.normal map=soils tests=1-3,14 col=flt1
53        computes the sample skewness and kurtosis, Geary's a-statistic and  an
54       approximate  normal  transformation, extreme normal deviates, and Roys‐
55       ton's W for the soils vector points.
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AUTHOR

61       James Darrell McCauley ,
62       when he was at: Agricultural Engineering Purdue University
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64       Last changed: $Date: 2006/01/02 14:44:52 $
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66       Full index
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70GRASS 6.2.2                                                        v.normal(1)