ts()</a></code> 
        </dt>
        <dd>Non-overlapping temporal aggregation of a time series</dd>
      </dl><dl><dt>
          
          <code><a href="balance_hierarchy.html">balance_hierarchy()</a></code> 
        </dt>
        <dd>Aggregation matrix of a (possibly) unbalanced hierarchy in balanced form</dd>
      </dl><dl><dt>
          
          <code><a href="commat.html">commat()</a></code> <code><a href="commat.html">commat_index()</a></code> 
        </dt>
        <dd>Commutation matrix</dd>
