v.db.univar(1)

1v.db.univar(1)                Grass User's Manual               v.db.univar(1)
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NAME

6       v.db.univar   - Calculates univariate statistics on selected table col‐
7       umn for a GRASS vector map.
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KEYWORDS

10       vector, statistics
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SYNOPSIS

13       v.db.univar
14       v.db.univar help
15       v.db.univar   [-e]   table=string   column=string     [database=string]
16       [driver=string]   [where=string]   [--verbose]  [--quiet]
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18   Flags:
19       -e
20           Extended statistics (quartiles and 90th percentile)
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22       --verbose
23           Verbose module output
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25       --quiet
26           Quiet module output
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28   Parameters:
29       table=string
30           Name of data table
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32       column=string
33           Column on which to calculate statistics (must be numeric)
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35       database=string
36           Database/directory for table
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38       driver=string
39           Database driver
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41       where=string
42           WHERE conditions of SQL statement without 'where' keyword
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DESCRIPTION

45       v.db.univar   -  Calculates  basic  univariate  statistics  for numeric
46       attributes in a data table. It will calculate minimum, maximum,  range,
47       mean,  standard  deviation,  variance,  coefficient of variation, quar‐
48       tiles, median, and 90th percentile. It uses db.select  to  create  list
49       values for statistical calculations.  (GRASS Shell Script)
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NOTES

52       Unless the database and driver are specified, it default the values set
53       in db.connect.
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EXAMPLE

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57       g.region rast=elevation.10m -p
58       v.random out=samples n=100
59       v.db.addtable samples col="heights double precision"
60       v.what.rast samples rast=elevation.10m col=heights
61       v.db.select samples
62       v.db.univar samples col=heights
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AUTHOR

69       Michael Barton, Arizona State University
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71       and authors of r.univar.sh
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73       Last changed: $Date: 2007-06-23 22:41:37 +0200 (Sat, 23 Jun 2007) $
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75       Full index
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77       © 2003-2008 GRASS Development Team
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81GRASS 6.3.0                                                     v.db.univar(1)