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<h2>NAME</h2>
<em><b>v.univar</b></em> - Calculates univariate statistics for attribute. Variance and standard deviation is calculated only for points if specified.
<h2>KEYWORDS</h2>
vector, statistics
<h2>SYNOPSIS</h2>
<b>v.univar</b><br>
<b>v.univar help</b><br>
<b>v.univar</b> [-<b>ged</b>] <b>map</b>=<em>name</em> [<b>layer</b>=<em>integer</em>] [<b>type</b>=<em>string</em>[,<i>string</i>,...]] [<b>column</b>=<em>string</em>] [<b>where</b>=<em>sql_query</em>] [<b>layer</b>=<em>integer</em>] [<b>percentile</b>=<em>integer</em>] [--<b>verbose</b>] [--<b>quiet</b>]
<h3>Flags:</h3>
<DL>
<DT><b>-g</b></DT>
<DD>Print the stats in shell script style</DD>
<DT><b>-e</b></DT>
<DD>Calculate extended statistics</DD>
<DT><b>-d</b></DT>
<DD>Calculate geometry distances instead of table data.</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>map</b>=<em>name</em></DT>
<DD>Name of input vector map</DD>
<DT><b>layer</b>=<em>integer</em></DT>
<DD>Layer number</DD>
<DD>A single vector map can be connected to multiple database tables. This number determines which table to use.</DD>
<DD>Default: <em>1</em></DD>
<DT><b>type</b>=<em>string[,<i>string</i>,...]</em></DT>
<DD>Feature type</DD>
<DD>Options: <em>point,line,boundary,centroid,area</em></DD>
<DD>Default: <em>point,line,area</em></DD>
<DT><b>column</b>=<em>string</em></DT>
<DD>Column name</DD>
<DT><b>where</b>=<em>sql_query</em></DT>
<DD>WHERE conditions of SQL statement without 'where' keyword</DD>
<DD>Example: income < 1000 and inhab >= 10000</DD>
<DT><b>layer</b>=<em>integer</em></DT>
<DD>Layer number</DD>
<DD>A single vector map can be connected to multiple database tables. This number determines which table to use.</DD>
<DD>Default: <em>1</em></DD>
<DT><b>percentile</b>=<em>integer</em></DT>
<DD>Percentile to calculate (requires extended statistics flag)</DD>
<DD>Options: <em>0-100</em></DD>
<DD>Default: <em>90</em></DD>
</DL>
<h2>DESCRIPTION</h2>
<em>v.univar</em> calculates univariate statistics of vector map features.
This includes the number of features counted, minimum and maximum values,
and range.
Variance and standard deviation is calculated only for points if
<tt>type=point</tt> is defined.
<p>
Extended statistics adds median, 1st and 3rd quartiles, and 90th
percentile.
<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 samples col=heights type=point
</pre></div>
<h2>SEE ALSO</h2>
<em><a href="v.neighbors.html">v.neighbors</a></em>
<h2>AUTHOR</h2>
Radim Blazek, ITC-irst
<p><i>Last changed: $Date: 2011-11-08 01:42:51 -0800 (Tue, 08 Nov 2011) $</i>
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