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]
Flags:
- -e
- Extended statistics (quartiles and 90th percentile)
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.univar.sh - 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
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.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: 2006/04/28 20:05:58 $
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