_mean.html">na_mean()</a></code> </p>
        </td>
        <td><p>Missing Value Imputation by Mean Value</p></td>
      </tr><tr><td>
          <p><code><a href="na_random.html">na_random()</a></code> </p>
        </td>
        <td><p>Missing Value Imputation by Random Sample</p></td>
      </tr><tr><td>
          <p><code><a href="na_remove.html">na_remove()</a></code> </p>
        </td>
        <td><p>Remove Missing Values</p></td>
      </tr><tr><td>
          <p><code><a href="na_replace.html">na_repla