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 10:42:51 +0100 (Tue, 08 Nov 2011) $ Full index © 2003-2014 GRASS Development Team