db.univar(1grass) GRASS GIS User's Manual db.univar(1grass)
NAME
db.univar - Calculates univariate statistics on selected table column.
KEYWORDS
database, statistics, attribute table
SYNOPSIS
db.univar
db.univar --help
db.univar [-eg] table=name column=name [database=name] [driver=name]
[where=sql_query] [percentile=float[,float,...]] [--help] [--ver-
bose] [--quiet] [--ui]
Flags:
-e
Extended statistics (quartiles and 90th percentile)
-g
Print stats in shell script style
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
table=name [required]
Name of attribute table
column=name [required]
Name of attribute column on which to calculate statistics (must be
numeric)
database=name
Name of database
driver=name
Name of database driver
Options: dbf, odbc, ogr, sqlite, pg
where=sql_query
WHERE conditions of SQL statement without ’where’ keyword
Example: income < 1000 and population >= 10000
percentile=float[,float,...]
Percentile to calculate (requires extended statistics flag)
Options: 0-100
Default: 90
DESCRIPTION
db.univar calculates basic univariate statistics for numeric attributes
in a data table. It will calculate minimum, maximum, range, mean, stan-
dard deviation, variance, coefficient of variation, quartiles, median,
and 90th percentile. It uses db.select to create list values for sta-
tistical calculations. NOTES If the database and driver are not speci-
fied, the default values set in db.connect will be used.
EXAMPLE
In this example, random points are sampled from the elevation map
(North Carolina sample dataset) and univariate statistics performed:
g.region raster=elevation -p
v.random output=samples n=100
v.db.addtable samples column="heights double precision"
v.what.rast samples raster=elevation column=heights
v.db.select samples
db.univar samples column=heights
SEE ALSO
v.db.univar, r.univar, v.univar, db.select, d.vect.thematic
AUTHOR
Michael Barton, Arizona State University
and authors of r.univar.sh
SOURCE CODE
Available at: db.univar source code (history)
Accessed: unknown
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GRASS 7.8.7 db.univar(1grass)
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