EVOLUTION-MANAGER
Edit File: Variogram.corExp.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: Calculate Semi-variogram for a corExp Object</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.corExp {nlme}"><tr><td>Variogram.corExp {nlme}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Calculate Semi-variogram for a corExp Object</h2> <h3>Description</h3> <p>This method function calculates the semi-variogram values corresponding to the Exponential correlation model, using the estimated coefficients corresponding to <code>object</code>, at the distances defined by <code>distance</code>. </p> <h3>Usage</h3> <pre> ## S3 method for class 'corExp' Variogram(object, distance, sig2, length.out, ...) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>object</code></td> <td> <p>an object inheriting from class <code>"<a href="corExp.html">corExp</a>"</code>, representing an exponential spatial correlation structure.</p> </td></tr> <tr valign="top"><td><code>distance</code></td> <td> <p>an optional numeric vector with the distances at which the semi-variogram is to be calculated. Defaults to <code>NULL</code>, in which case a sequence of length <code>length.out</code> between the minimum and maximum values of <code>getCovariate(object)</code> is used.</p> </td></tr> <tr valign="top"><td><code>sig2</code></td> <td> <p>an optional numeric value representing the process variance. Defaults to <code>1</code>.</p> </td></tr> <tr valign="top"><td><code>length.out</code></td> <td> <p>an optional integer specifying the length of the sequence of distances to be used for calculating the semi-variogram, when <code>distance = NULL</code>. Defaults to <code>50</code>.</p> </td></tr> <tr valign="top"><td><code>...</code></td> <td> <p>some methods for this generic require additional arguments. None are used in this method.</p> </td></tr> </table> <h3>Value</h3> <p>a data frame with columns <code>variog</code> and <code>dist</code> representing, respectively, the semi-variogram values and the corresponding distances. The returned value inherits from class <code>Variogram</code>. </p> <h3>Author(s)</h3> <p>José Pinheiro and Douglas Bates <a href="mailto:bates@stat.wisc.edu">bates@stat.wisc.edu</a></p> <h3>References</h3> <p>Cressie, N.A.C. (1993), "Statistics for Spatial Data", J. Wiley & Sons. </p> <h3>See Also</h3> <p><code><a href="corExp.html">corExp</a></code>, <code><a href="plot.Variogram.html">plot.Variogram</a></code>, <code><a href="Variogram.html">Variogram</a></code> </p> <h3>Examples</h3> <pre> stopifnot(require("stats", quietly = TRUE)) cs1 <- corExp(3, form = ~ Time | Rat) cs1 <- Initialize(cs1, BodyWeight) Variogram(cs1)[1:10,] </pre> <hr /><div style="text-align: center;">[Package <em>nlme</em> version 3.1-139 <a href="00Index.html">Index</a>]</div> </body></html>