<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>GRASS GIS: v.univar.sh</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <link rel="stylesheet" href="grassdocs.css" type="text/css"> </head> <body bgcolor="white"> <img src="grass_logo.png" alt="GRASS logo"><hr align=center size=6 noshade> <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> <EM><b>v.univar.sh</b></EM> - 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 r.univar.sh and uses db.select to create a list values for statistical calculations. This script could be replaced by an updated v.univar.<br> <EM>(GRASS Shell Script)</EM> <H2>NOTES</H2> Unless the database and driver are specified, it default the 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 r.univar.sh <p><i>Last changed: $Date: 2006-04-28 22:05:58 +0200 (Fri, 28 Apr 2006) $</i> <HR> <P><a href="index.html">Main index</a> - <a href="vector.html">vector index</a> - <a href="full_index.html">Full index</a></P> <P>© 2003-2008 <a href="http://grass.osgeo.org">GRASS Development Team</a></p> </body> </html>
