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<title>GRASS GIS manual: v.univar.sh</title>
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<h2>NAME</h2>
<em><b>v.univar.sh</b></em> - Calculates univariate statistics on selected table column for a GRASS vector map.
<h2>KEYWORDS</h2>
vector, statistics
<h2>SYNOPSIS</h2>
<b>v.univar.sh</b><br>
<b>v.univar.sh help</b><br>
<b>v.univar.sh</b> [-<b>e</b>] <b>table</b>=<em>string</em> <b>column</b>=<em>string</em> [<b>database</b>=<em>string</em>] [<b>driver</b>=<em>string</em>] [<b>where</b>=<em>string</em>] [--<b>verbose</b>] [--<b>quiet</b>]
<h3>Flags:</h3>
<DL>
<DT><b>-e</b></DT>
<DD>Extended statistics (quartiles and 90th percentile)</DD>
<DT><b>--verbose</b></DT>
<DD>Verbose module output</DD>
<DT><b>--quiet</b></DT>
<DD>Quiet module output</DD>
</DL>
<h3>Parameters:</h3>
<DL>
<DT><b>table</b>=<em>string</em></DT>
<DD>Name of data table</DD>
<DT><b>column</b>=<em>string</em></DT>
<DD>Column on which to calculate statistics (must be numeric)</DD>
<DT><b>database</b>=<em>string</em></DT>
<DD>Database/directory for table</DD>
<DT><b>driver</b>=<em>string</em></DT>
<DD>Database driver</DD>
<DT><b>where</b>=<em>string</em></DT>
<DD>WHERE conditions of SQL statement without 'where' keyword</DD>
</DL>
<h2>DESCRIPTION</h2>
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 <em>r.univar.sh</em> and uses
<em>db.select</em> to create a list values for statistical calculations.
This script could be replaced by an updated <em>v.univar</em>.
<p>
<em>(GRASS Shell Script)</em>
<h2>NOTES</h2>
If the database and driver are not specified, the module will use the default
values set in <em>db.connect</em>.
<h2>EXAMPLE</h2>
<div class="code"><pre>
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
</pre></div>
<h2>SEE ALSO</h2>
<em>
<a href="r.univar.html">r.univar</a>,
<a href="r.univar.sh.html">r.univar.sh</a>,
<a href="v.univar.html">v.univar,</a>,
<a href="db.select.html">db.select</a>,
<a href="d.vect.thematic.html">d.vect.thematic</a></em>
<p> AUTHORS
v.univar.sh: Michael Barton, Arizona State University
<p>
and authors of <em>r.univar.sh</em>
<p>
<i>Last changed: $Date: 2011-11-08 01:42:51 -0800 (Tue, 08 Nov 2011) $</i>
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