orvitz-Thompson estimator, and <code>"YG"</code> indicates the
Yates-Grundy estimator.  The default value is <code>"Local"</code>.</p></dd>


<dt>jointprob</dt>
<dd><p>Character value providing the choice of joint inclusion
probability approximation for use with Horvitz-Thompson and Yates-Grundy
variance estimators, where <code>"overton"</code> indicates the Overton
approximation, <code>"hr"</code> indicates the Hartley-Rao approximation, and
<code>"brewer"</code> equals the Brewer approximation.  The defau