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v.db.univar
Langue: en
Version: 369222 (fedora - 01/12/10)
Section: 1 (Commandes utilisateur)
NAME
v.db.univar - Calculates univariate statistics on selected table column for a GRASS vector map.KEYWORDS
vector, statisticsSYNOPSIS
v.db.univarv.db.univar help
v.db.univar [-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
v.db.univar - 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 uses db.select to create list values for statistical calculations. (GRASS Shell Script)NOTES
Unless the database and driver are specified, it default the 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.db.univar samples col=heights
SEE ALSO
r.univar, v.univar,, db.select, d.vect.thematicAUTHOR
Michael Barton, Arizona State Universityand authors of r.univar.sh
Last changed: $Date: 2007-06-23 22:41:37 +0200 (Sat, 23 Jun 2007) $
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