v.normal v.normal help v.normal [-rql] map=stringtests=range[,range,...] column=string
Flags:
-r
Use only points in current region
-q
Quiet
-l
lognormal
Parameters:
map=string
point vector defining sample points
tests=range[,range,...]
Lists of tests (1-15): e.g. 1,3-8,13
column=string
Attribute column
DESCRIPTION
v.normal
computes tests of normality on vector points.
NOTES
The tests that v.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
v.normal map=soils tests=1-3,14 col=flt1
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 vector points.