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v.univar
Langue: en
Version: 369343 (fedora - 01/12/10)
Section: 1 (Commandes utilisateur)
NAME
v.univar - Calculates univariate statistics for attribute. Variance and standard deviation is calculated only for points if specified.KEYWORDS
vector, statisticsSYNOPSIS
v.univarv.univar help
v.univar [-ge] 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- --verbose
Verbose module output- --quiet
Quiet module output
Parameters:
- map=name
Name of input vector map- type=string[,string,...]
Type
Feature type(s)
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.neighborsAUTHOR
Radim Blazek, ITC-irstLast changed: $Date: 2007-02-15 15:27:17 +0100 (Thu, 15 Feb 2007) $
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