Subtraction Q-Matrix</p></td>
      </tr><tr><td>
          <p><code><a href="gdd.html">gdd()</a></code> </p>
        </td>
        <td><p>Generalized Distance Discriminating Method</p></td>
      </tr><tr><td>
          <p><code><a href="gdina.dif.html">gdina.dif()</a></code> <code><a href="gdina.dif.html">summary(<i>&lt;gdina.dif&gt;</i>)</a></code> </p>
        </td>
        <td><p>Differential Item Functioning in the GDINA Model</p></td>
      </tr><tr><td>
          <p><code><a href="gdina.html">gdina(