db.univar(1grass) | Grass User's Manual | db.univar(1grass) |
db.univar - Calculates univariate statistics on selected table column.
database, statistics, attribute table
db.univar
db.univar --help
db.univar [-eg] table=name
column=name [database=name]
[driver=name] [where=sql_query]
[percentile=float[,float,...]] [--help]
[--verbose] [--quiet] [--ui]
db.univar calculates basic univariate statistics for numeric attributes in a data 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 If the database and driver are not specified, the default values set in db.connect will be used.
In this example, random points are sampled from the elevation map
(North Carolina sample dataset) and univariate statistics performed:
g.region raster=elevation -p v.random output=samples n=100 v.db.addtable samples column="heights double precision" v.what.rast samples raster=elevation column=heights v.db.select samples db.univar samples column=heights
v.db.univar, r.univar, v.univar, db.select, d.vect.thematic
Michael Barton, Arizona State University
and authors of r.univar.sh
Last changed: $Date: 2016-11-14 00:05:32 +0100 (Mon, 14 Nov 2016) $
Available at: db.univar source code (history)
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