DESCRIPTION

v.db.univar calculates basic univariate statistics for numeric attributes in a vector attribute table. It will calculate minimum, maximum, range, mean, standard deviation, variance, coefficient of variation, quartiles, median, and 90th percentile. It uses db.select to create list values for statistical calculations. NOTES A database connection must be defined for the selected vector layer.

EXAMPLE

In this example, random points are sampled from the elevation map (North Carolina sample dataset) and univariate statistics performed: 
g.region rast=elevation -p
v.random output=samples n=100
v.db.addtable samples column="heights double precision"
v.what.rast samples raster=elevation colum=heights
v.db.select samples

v.db.univar samples colum=heights

SEE ALSO

db.univar, r.univar, v.univar, db.select, d.vect.thematic

AUTHOR

Michael Barton, Arizona State University

and authors of r.univar.sh

Last changed: $Date$