 for a two-stage sample, values must be supplied for
arguments <code>weight</code> and <code>weight1</code>. The default value is <code>FALSE</code>.</p></dd>


<dt>sweight</dt>
<dd><p>Character value providing the name of the size weight variable
in <code>dframe</code>.  For a two-stage sample, the size weight
variable identifies stage two size weights.  The default value is
<code>NULL</code>.</p></dd>


<dt>sweight1</dt>
<dd><p>Character value providing name of the stage one size weight
variable in <code>