art_date()</a></code> <code><a href="find_date_cause.html">find_end_date()</a></code> <code><a href="find_date_cause.html">constrain_dates()</a></code> <code><a href="find_date_cause.html">assert_positive_timespan()</a></code> </p>
        </td>
        <td><p>Find the first date beyond a cutoff in several columns</p></td>
      </tr></tbody><tbody><tr><th colspan="2">
          <h2 id="add-population-weights-to-complex-survey-design-data">Add population weights to complex survey design data <a href="#add-p