EVOLUTION-MANAGER
Edit File: variogram.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: Compute Spatial Variogram</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 variogram {spatial}"><tr><td>variogram {spatial}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2> Compute Spatial Variogram </h2> <h3>Description</h3> <p>Compute spatial (semi-)variogram of spatial data or residuals. </p> <h3>Usage</h3> <pre> variogram(krig, nint, plotit = TRUE, ...) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>krig</code></td> <td> <p>trend-surface or kriging object with columns <code>x</code>, <code>y</code>, and <code>z</code> </p> </td></tr> <tr valign="top"><td><code>nint</code></td> <td> <p>number of bins used </p> </td></tr> <tr valign="top"><td><code>plotit</code></td> <td> <p>logical for plotting </p> </td></tr> <tr valign="top"><td><code>...</code></td> <td> <p>parameters for the plot </p> </td></tr></table> <h3>Details</h3> <p>Divides range of data into <code>nint</code> bins, and computes the average squared difference for pairs with separation in each bin. Returns results for bins with 6 or more pairs. </p> <h3>Value</h3> <p><code>x</code> and <code>y</code> coordinates of the variogram and <code>cnt</code>, the number of pairs averaged per bin. </p> <h3>Side Effects</h3> <p>Plots the variogram if <code>plotit = TRUE</code> </p> <h3>References</h3> <p>Ripley, B. D. (1981) <em>Spatial Statistics.</em> Wiley. </p> <p>Venables, W. N. and Ripley, B. D. (2002) <em>Modern Applied Statistics with S.</em> Fourth edition. Springer. </p> <h3>See Also</h3> <p><code><a href="correlogram.html">correlogram</a></code> </p> <h3>Examples</h3> <pre> data(topo, package="MASS") topo.kr <- surf.ls(2, topo) variogram(topo.kr, 25) </pre> <hr /><div style="text-align: center;">[Package <em>spatial</em> version 7.3-11 <a href="00Index.html">Index</a>]</div> </body></html>