use of residuals (obtained, in this case, from a nonparametric estimation of the trend function) in semivariogram estimation.</p></li>
<li><p><code><a href="reference/fitsvar.sb.iso.html">fitsvar.sb.iso()</a></code> fits a ‘nonparametric’ isotropic Shapiro-Botha variogram model by WLS. Currently, only isotropic semivariogram estimation is supported.</p></li>
</ul>
<p>Nonparametric residual kriging (sometimes called external drift kriging):</p>
<ul>
<li><p><code><a href="reference/np.kriging.html">np.kri