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v.db.univar

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v.db.univar: Calculates univariate statistics on selected table column for a GRASS vector map.

NAME
v.db.univar - Calculates univariate statistics on selected table column for a GRASS vector map.
KEYWORDS
vector, statistics

SYNOPSIS

v.db.univar v.db.univar help v.db.univar [-e] table=string column=string [database=string] [driver=string] [where=string] [--verbose] [--quiet] Flags: -e Extended statistics (quartiles and 90th percentile) --verbose Verbose module output --quiet Quiet module output Parameters: table=string Name of data table column=string Column on which to calculate statistics (must be numeric) database=string Database/directory for table driver=string Database driver where=string WHERE conditions of SQL statement without 'where' keyword

DESCRIPTION

v.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. (GRASS Shell Script)

NOTES

If the database and driver are not specified, the default values set in db.connect will be used.

EXAMPLE

g.region rast=elevation.10m -p v.random out=samples n=100 v.db.addtable samples col="heights double precision" v.what.rast samples rast=elevation.10m col=heights v.db.select samples v.db.univar samples col=heights
SEE ALSO
r.univar, v.univar,, db.select, d.vect.thematic
AUTHOR
Michael Barton, Arizona State University and authors of r.univar.sh Last changed: $Date: 2008-03-13 09:01:14 +0100 (Thu, 13 Mar 2008) $ Full index (C) 2003-2010 GRASS Development Team V.DB.UNIVAR(1)
 
 
 

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