DESCRIPTION
r.univar calculates the univariate statistics of a raster map.
This includes the number of cells counted, minimum and maximum cell values,
range, arithmetic mean, population variance, standard deviation, and
coefficient of variation.
If the -e extended statistics flag is given the 1st quartile, median,
3rd quartile, and given percentile are calculated.
If the -g flag is given the results are presented in a format suitable
for use in a shell script.
NOTES
As with most GRASS raster modules, r.univar operates on the cell
array defined by the current region settings, not the original extent and
resolution of the input map. See g.region.
This module can use large amounts of system memory when the -e
extended statistics flag is used with a very large region setting. If the
region is too large the module should exit gracefully with a memory allocation
error. Basic statistics can be calculated using any size input region.
TODO
mode, skewness, kurtosis
SEE ALSO
g.region
r3.univar
r.univar.sh
r.average
r.median
r.mode
r.sum
r.series
r.stats
r.statistics
v.univar
v.univar.sh
AUTHORS
Hamish Bowman, Otago University, New Zealand
Extended statistics by Martin Landa
Last changed: $Date$