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) $
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© 2003-2011 GRASS Development Team
