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<div class="header">
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<a href="#func-members">Functions</a>  </div>
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<div class="title">cross_validation.sql_in File Reference</div>  </div>
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<div class="contents">

<p>SQL functions for cross validation.  
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a2a7791b05f51e8748ab7b6ccf328a7e2"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="cross__validation_8sql__in.html#a2a7791b05f51e8748ab7b6ccf328a7e2">cross_validation_general</a> (varchar modelling_func, varchar[] modelling_params, varchar[] modelling_params_type, varchar param_explored, varchar[] explore_values, varchar predict_func, varchar[] predict_params, varchar[] predict_params_type, varchar metric_func, varchar[] metric_params, varchar[] metric_params_type, varchar data_tbl, varchar data_id, boolean id_is_random, varchar validation_result, varchar[] data_cols, integer n_folds)</td></tr>
<tr class="separator:a2a7791b05f51e8748ab7b6ccf328a7e2"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5efbb27898e99f7685816d9d5dfd082c"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="cross__validation_8sql__in.html#a5efbb27898e99f7685816d9d5dfd082c">cross_validation_general</a> (varchar modelling_func, varchar[] modelling_params, varchar[] modelling_params_type, varchar param_explored, varchar[] explore_values, varchar predict_func, varchar[] predict_params, varchar[] predict_params_type, varchar metric_func, varchar[] metric_params, varchar[] metric_params_type, varchar data_tbl, varchar data_id, boolean id_is_random, varchar validation_result, varchar[] data_cols)</td></tr>
<tr class="separator:a5efbb27898e99f7685816d9d5dfd082c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa151eb3fa9acc7f4cc33236e22ad4362"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="cross__validation_8sql__in.html#aa151eb3fa9acc7f4cc33236e22ad4362">cv_linregr_train</a> (varchar tbl_source, varchar col_ind_var, varchar col_dep_var, varchar tbl_result)</td></tr>
<tr class="memdesc:aa151eb3fa9acc7f4cc33236e22ad4362"><td class="mdescLeft">&#160;</td><td class="mdescRight">A wrapper for linear regression.  <a href="#aa151eb3fa9acc7f4cc33236e22ad4362">More...</a><br /></td></tr>
<tr class="separator:aa151eb3fa9acc7f4cc33236e22ad4362"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa572f1f57c0dd106b30948928161d8cc"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="cross__validation_8sql__in.html#aa572f1f57c0dd106b30948928161d8cc">cv_linregr_predict</a> (varchar tbl_model, varchar tbl_newdata, varchar col_ind_var, varchar col_id, varchar tbl_predict)</td></tr>
<tr class="memdesc:aa572f1f57c0dd106b30948928161d8cc"><td class="mdescLeft">&#160;</td><td class="mdescRight">A wrapper for linear regression prediction.  <a href="#aa572f1f57c0dd106b30948928161d8cc">More...</a><br /></td></tr>
<tr class="separator:aa572f1f57c0dd106b30948928161d8cc"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a2cd71e756f90b0c4fa46f508a1ca261e"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="cross__validation_8sql__in.html#a2cd71e756f90b0c4fa46f508a1ca261e">mse_error</a> (varchar tbl_prediction, varchar tbl_actual, varchar id_actual, varchar values_actual, varchar tbl_error)</td></tr>
<tr class="separator:a2cd71e756f90b0c4fa46f508a1ca261e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ad01cd1c97ae1be0ac7cd6c42abb75bb2"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="cross__validation_8sql__in.html#ad01cd1c97ae1be0ac7cd6c42abb75bb2">misclassification_avg</a> (varchar tbl_prediction, varchar tbl_actual, varchar id_actual, varchar values_actual, varchar tbl_error)</td></tr>
<tr class="separator:ad01cd1c97ae1be0ac7cd6c42abb75bb2"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ac7dbc115f0c4624ccbf62b2d5494388d"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="cross__validation_8sql__in.html#ac7dbc115f0c4624ccbf62b2d5494388d">cv_logregr_predict</a> (varchar tbl_model, varchar tbl_newdata, varchar col_ind_var, varchar col_id, varchar tbl_predict)</td></tr>
<tr class="memdesc:ac7dbc115f0c4624ccbf62b2d5494388d"><td class="mdescLeft">&#160;</td><td class="mdescRight">A prediction function for logistic regression The result is stored in the table of tbl_predict.  <a href="#ac7dbc115f0c4624ccbf62b2d5494388d">More...</a><br /></td></tr>
<tr class="separator:ac7dbc115f0c4624ccbf62b2d5494388d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a2d1571ffa794176a5dfed9d35e70fed7"><td class="memItemLeft" align="right" valign="top">integer&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="cross__validation_8sql__in.html#a2d1571ffa794176a5dfed9d35e70fed7">logregr_accuracy</a> (float8[] coef, float8[] col_ind, boolean col_dep)</td></tr>
<tr class="memdesc:a2d1571ffa794176a5dfed9d35e70fed7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Metric function for logistic regression.  <a href="#a2d1571ffa794176a5dfed9d35e70fed7">More...</a><br /></td></tr>
<tr class="separator:a2d1571ffa794176a5dfed9d35e70fed7"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ac1b5c57473ff672af45191c8d53f46ed"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="cross__validation_8sql__in.html#ac1b5c57473ff672af45191c8d53f46ed">cv_logregr_accuracy</a> (varchar tbl_predict, varchar tbl_source, varchar col_id, varchar col_dep_var, varchar tbl_accuracy)</td></tr>
<tr class="memdesc:ac1b5c57473ff672af45191c8d53f46ed"><td class="mdescLeft">&#160;</td><td class="mdescRight">Metric function for logistic regression.  <a href="#ac1b5c57473ff672af45191c8d53f46ed">More...</a><br /></td></tr>
<tr class="separator:ac1b5c57473ff672af45191c8d53f46ed"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><dl class="section date"><dt>Date</dt><dd>January 2011</dd></dl>
<dl class="section see"><dt>See also</dt><dd>For a brief introduction to the usage of cross validation, see the module description <a class="el" href="group__grp__validation.html">Cross Validation</a>. </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a2a7791b05f51e8748ab7b6ccf328a7e2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a2a7791b05f51e8748ab7b6ccf328a7e2">&#9670;&nbsp;</a></span>cross_validation_general() <span class="overload">[1/2]</span></h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void cross_validation_general </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>modelling_func</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>modelling_params</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>modelling_params_type</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>param_explored</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>explore_values</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>predict_func</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>predict_params</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>predict_params_type</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>metric_func</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>metric_params</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>metric_params_type</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>data_tbl</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>data_id</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">boolean&#160;</td>
          <td class="paramname"><em>id_is_random</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>validation_result</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>data_cols</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">integer&#160;</td>
          <td class="paramname"><em>n_folds</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="a5efbb27898e99f7685816d9d5dfd082c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a5efbb27898e99f7685816d9d5dfd082c">&#9670;&nbsp;</a></span>cross_validation_general() <span class="overload">[2/2]</span></h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void cross_validation_general </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>modelling_func</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>modelling_params</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>modelling_params_type</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>param_explored</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>explore_values</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>predict_func</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>predict_params</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>predict_params_type</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>metric_func</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>metric_params</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>metric_params_type</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>data_tbl</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>data_id</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">boolean&#160;</td>
          <td class="paramname"><em>id_is_random</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>validation_result</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar []&#160;</td>
          <td class="paramname"><em>data_cols</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="aa572f1f57c0dd106b30948928161d8cc"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa572f1f57c0dd106b30948928161d8cc">&#9670;&nbsp;</a></span>cv_linregr_predict()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void cv_linregr_predict </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_model</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_newdata</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>col_ind_var</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>col_id</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_predict</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a id="aa151eb3fa9acc7f4cc33236e22ad4362"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa151eb3fa9acc7f4cc33236e22ad4362">&#9670;&nbsp;</a></span>cv_linregr_train()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void cv_linregr_train </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_source</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>col_ind_var</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>col_dep_var</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_result</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
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<h2 class="memtitle"><span class="permalink"><a href="#ac1b5c57473ff672af45191c8d53f46ed">&#9670;&nbsp;</a></span>cv_logregr_accuracy()</h2>

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          <td class="memname">void cv_logregr_accuracy </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_predict</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_source</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>col_id</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>col_dep_var</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_accuracy</em>&#160;</td>
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          <td></td>
          <td>)</td>
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<p>It computes the percentage of correct predictions. The result is stored in the table of tbl_accuracy </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ac7dbc115f0c4624ccbf62b2d5494388d">&#9670;&nbsp;</a></span>cv_logregr_predict()</h2>

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          <td class="memname">void cv_logregr_predict </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_model</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_newdata</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>col_ind_var</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>col_id</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_predict</em>&#160;</td>
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          <td></td>
          <td>)</td>
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<p>This function can be used together with cross-validation </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a2d1571ffa794176a5dfed9d35e70fed7">&#9670;&nbsp;</a></span>logregr_accuracy()</h2>

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          <td class="memname">integer logregr_accuracy </td>
          <td>(</td>
          <td class="paramtype">float8 []&#160;</td>
          <td class="paramname"><em>coef</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8 []&#160;</td>
          <td class="paramname"><em>col_ind</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">boolean&#160;</td>
          <td class="paramname"><em>col_dep</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
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<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">coef</td><td>Logistic fitting coefficients. Note: MADlib logregr_train function, unlike elastic_net, does not produce a separate intercept term. </td></tr>
    <tr><td class="paramname">col_ind</td><td>Independent variable, an array </td></tr>
    <tr><td class="paramname">col_dep</td><td>Dependent variable</td></tr>
  </table>
  </dd>
</dl>
<p>returns 1 if the prediction is the same as col_dep, otherwise 0 </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ad01cd1c97ae1be0ac7cd6c42abb75bb2">&#9670;&nbsp;</a></span>misclassification_avg()</h2>

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          <td class="memname">void misclassification_avg </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_prediction</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_actual</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>id_actual</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>values_actual</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_error</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

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<h2 class="memtitle"><span class="permalink"><a href="#a2cd71e756f90b0c4fa46f508a1ca261e">&#9670;&nbsp;</a></span>mse_error()</h2>

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          <td class="memname">void mse_error </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_prediction</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_actual</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>id_actual</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>values_actual</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>tbl_error</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
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