Geografic-Information-System/scripts/v.db.univar/v.db.univar.html

<h2>DESCRIPTION</h2>

<em>v.db.univar</em> calculates basic univariate statistics for numeric
attributes in a vector attribute table. It will calculate minimum, 
maximum, range, mean, standard deviation, variance, coefficient of 
variation, quartiles, median, and 90th percentile.
It uses <em>db.select</em> to create list values for statistical calculations.

<em>NOTES</em>

A database connection must be defined for the selected vector layer.

<h2>EXAMPLE</h2>

In this example, random points are sampled from the elevation map
(North Carolina sample dataset) and univariate statistics performed:
<div class="code"><pre>
g.region rast=elevation -p
v.random output=samples n=100
v.db.addtable samples column="heights double precision"
v.what.rast samples raster=elevation colum=heights
v.db.select samples

v.db.univar samples colum=heights
</pre></div>

<h2>SEE ALSO</h2>

<em>
<a href="db.univar.html">db.univar</a>,
<a href="r.univar.html">r.univar</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>

<h2>AUTHOR</h2>
 Michael Barton, Arizona State University
<p>and authors of <em>r.univar.sh</em>

<p><i>Last changed: $Date$</i>