v.univar.sh(1)

NAME
v.univar.sh - calculates univariate statistics on selected table column for a GRASS vector map

KEYWORDS
vector, statistics

SYNOPSIS
v.univar.sh
v.univar.sh help
v.univar.sh [-e] table=string column=string [database=string] [driver=string] [where=string]

  Flags:

-e  extended statistics (quartiles and 90th percentile)

  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.univar.sh - 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 is closely based on r.univar.sh and uses db.select to create a list values for statistical calculations. This script could be replaced by an updated v.univar.
(GRASS Shell Script)

NOTES
Unless the database and driver are specified, it default the values set in db.connect.

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.univar.sh samples col=heights

SEE ALSO
r.univar, r.univar.sh, v.univar,, db.select, d.vect.thematic

 AUTHORS v.univar.sh: Michael Barton, Arizona State University

and authors of r.univar.sh

Last changed: $Date: 2006/04/28 20:05:58 $

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