GRASS GIS manual: v.univar.sh

Note: A new GRASS GIS stable version has been released: GRASS GIS 7. Go directly to the new manual page here

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