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Edit File: columb.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Reduced version of Columbus OH crime data</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for columb {mgcv}"><tr><td>columb {mgcv}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Reduced version of Columbus OH crime data</h2> <h3>Description</h3> <p>By district crime data from Columbus OH, together with polygons describing district shape. Useful for illustrating use of simple Markov Random Field smoothers. </p> <h3>Usage</h3> <pre> data(columb) data(columb.polys) </pre> <h3>Format</h3> <p><code>columb</code> is a 49 row data frame with the following columns </p> <dl> <dt>area</dt><dd><p>land area of district</p> </dd> <dt>home.value</dt><dd><p>housing value in 1000USD.</p> </dd> <dt>income</dt><dd><p>household income in 1000USD.</p> </dd> <dt>crime</dt><dd><p>residential burglaries and auto thefts per 1000 households.</p> </dd> <dt>open.space</dt><dd><p>measure of open space in district.</p> </dd> <dt>district</dt><dd><p>code identifying district, and matching <code>names(columb.polys)</code>. </p> </dd> </dl> <p><code>columb.polys</code> contains the polygons defining the areas in the format described below. </p> <h3>Details</h3> <p>The data frame <code>columb</code> relates to the districts whose boundaries are coded in <code>columb.polys</code>. <code>columb.polys[[i]]</code> is a 2 column matrix, containing the vertices of the polygons defining the boundary of the ith district. <code>columb.polys[[2]]</code> has an artificial hole inserted to illustrate how holes in districts can be spefified. Different polygons defining the boundary of a district are separated by NA rows in <code>columb.polys[[1]]</code>, and a polygon enclosed within another is treated as a hole in that region (a hole should never come first). <code>names(columb.polys)</code> matches <code>columb$district</code> (order unimportant). </p> <h3>Source</h3> <p>The data are adapted from the <code>columbus</code> example in the <code>spdep</code> package, where the original source is given as: </p> <p>Anselin, Luc. 1988. Spatial econometrics: methods and models. Dordrecht: Kluwer Academic, Table 12.1 p. 189. </p> <h3>Examples</h3> <pre> ## see ?mrf help files </pre> <hr /><div style="text-align: center;">[Package <em>mgcv</em> version 1.8-28 <a href="00Index.html">Index</a>]</div> </body></html>