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v.univar

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v.univar: Calculates univariate statistics for attribute. Variance and standard deviation is calculated only for points if

NAME

v.univar - Calculates univariate statistics for attribute. Variance and standard deviation is calculated only for points if specified.

KEYWORDS

vector, statistics
SYNOPSIS
v.univar v.univar help v.univar [-ged] map=name [type=string[,string,...]] [column=string] [where=sql_query] [layer=integer] [percentile=integer] [--verbose] [--quiet] Flags: -g Print the stats in shell script style -e Calculate extended statistics -d Calculate geometry distances instead of table data. --verbose Verbose module output --quiet Quiet module output Parameters: map=name Name of input vector map type=string[,string,...] Feature type Options: point,line,boundary,centroid,area Default: point,line,boundary,centroid,area column=string Column name where=sql_query WHERE conditions of SQL statement without 'where' keyword Example: income = 10000 layer=integer Layer number A single vector map can be connected to multiple database tables. This number determines which table to use. Default: 1 percentile=integer Percentile to calculate (requires extended statistics flag) Options: 0-100 Default: 90
DESCRIPTION
v.univar calculates univariate statistics of vector map features. This includes the number of features counted, minimum and maximum values, and range. Variance and standard deviation is calculated only for points if type=point is defined. Extended statistics adds median, 1st and 3rd quartiles, and 90th percentile.

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 samples col=heights type=point

SEE ALSO

v.neighbors

AUTHOR

Radim Blazek, ITC-irst Last changed: $Date: 2007-02-15 15:27:17 +0100 (Thu, 15 Feb 2007) $ Full index (C) 2003-2010 GRASS Development Team V.UNIVAR(1)
 
 
 

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