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]
       [--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

       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

       If the database and driver are not specified, the module will use the default 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: 2011-11-08 01:42:51 -0800 (Tue, 08 Nov 2011) $

       Full index

       © 2003-2013 GRASS Development Team

GRASS 6.4.3                                                                                  v.univar.sh(1grass)