.  If a data frame is used for <code>popsize</code>, the
  variable containing population totals must be the last variable in the data
  frame.  If a table is used for <code>popsize</code>, the table must have named
  <code>dimnames</code> where the names identify factor variables in the
  <code>dframe</code> data frame.  If the popsize argument is equal to <code>NULL</code>,
  then neither calibration nor post-stratification is performed.  The default
  value is <code>NULL</code>.</p>
<p>Example popsize fo