s.html">df_stats()</a></code> have been adjusted somewhat. While this has the potential to break old code that relied on the names, the new system is clearer, supports a wider range of applications, and fixes a bug.</p></li>
<li><p>A <code><a href="../reference/props.html">counts()</a></code> method for factors has been added. This method includes counts of 0 for levels that do not occur.</p></li>
<li><p>Formulas in <code><a href="../reference/df_stats.html">df_stats()</a></code> are preprosessed so that <c