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     [layer=integer]      [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

       layer=integer
           Layer number
           A single vector map can be connected to multiple database tables. This number determines which  table
           to use.
           Default: 1

       type=string[,string,...]
           Feature type
           Options: point,line,boundary,centroid,area
           Default: point,line,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: 2011-11-08 01:42:51 -0800 (Tue, 08 Nov 2011) $

       Full index

       © 2003-2013 GRASS Development Team

GRASS 6.4.3                                                                                     v.univar(1grass)