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<title>MADlib: correlation.sql_in File Reference</title>
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<div class="header">
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<div class="title">correlation.sql_in File Reference</div>  </div>
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<p>SQL functions for correlation computation.  
<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:ae6223d0ba3e2b8a2d298ee78a293be6a"><td class="memItemLeft" align="right" valign="top">float8 []&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="correlation_8sql__in.html#ae6223d0ba3e2b8a2d298ee78a293be6a">correlation_transition</a> (float8[] state, float8[] x, float8[] <a class="el" href="svec__util_8sql__in.html#a546b947319c9f48237120a31929bdfd9">mean</a>)</td></tr>
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<tr class="memitem:ac53cf4dd28185715a1798176bce44b1b"><td class="memItemLeft" align="right" valign="top">float8 []&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="correlation_8sql__in.html#ac53cf4dd28185715a1798176bce44b1b">correlation_merge</a> (float8[] left_state, float8[] right_state)</td></tr>
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<tr class="memitem:a85a1a9b0ae5e608fd235f08ae01ff966"><td class="memItemLeft" align="right" valign="top">float8 []&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="correlation_8sql__in.html#a85a1a9b0ae5e608fd235f08ae01ff966">correlation_final</a> (float8[] state)</td></tr>
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<tr class="memitem:a1c3081444f6bafc88a9b377f2af32968"><td class="memItemLeft" align="right" valign="top">aggregate float8 []&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="correlation_8sql__in.html#a1c3081444f6bafc88a9b377f2af32968">correlation_agg</a> (float8[], float8[])</td></tr>
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<tr class="memitem:a5c4f4adaf75fe3406bf1d0a20f8512ac"><td class="memItemLeft" align="right" valign="top">aggregate float8 []&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="correlation_8sql__in.html#a5c4f4adaf75fe3406bf1d0a20f8512ac">covariance_agg</a> (float8[], float8[])</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><dl class="section date"><dt>Date</dt><dd>April 2013</dd></dl>
<dl class="section see"><dt>See also</dt><dd>For a brief introduction to <a class="el" href="correlation_8sql__in.html#a91bb3c218f470e1184a1c16b66307393">correlation</a>, see the module description <a class="el" href="group__grp__correlation.html">Covariance and Correlation</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a91bb3c218f470e1184a1c16b66307393"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a91bb3c218f470e1184a1c16b66307393">&#9670;&nbsp;</a></span>correlation() <span class="overload">[1/7]</span></h2>

<div class="memitem">
<div class="memproto">
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          <td class="memname">text correlation </td>
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        <tr>
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          <td class="paramkey"></td>
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</div><div class="memdoc">

</div>
</div>
<a id="a23198d24ba486323eea49bb2ef97ddb8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a23198d24ba486323eea49bb2ef97ddb8">&#9670;&nbsp;</a></span>correlation() <span class="overload">[2/7]</span></h2>

<div class="memitem">
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        <tr>
          <td class="memname">text correlation </td>
          <td>(</td>
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          <td class="paramkey"></td>
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          <td class="paramkey"></td>
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</div>
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<a id="ada17a10ea8a6c4580e7413c86ae5345e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ada17a10ea8a6c4580e7413c86ae5345e">&#9670;&nbsp;</a></span>correlation() <span class="overload">[3/7]</span></h2>

<div class="memitem">
<div class="memproto">
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        <tr>
          <td class="memname">text correlation </td>
          <td>(</td>
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          <td class="paramkey"></td>
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<a id="a30437d71937df60681be42769d5d3a29"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a30437d71937df60681be42769d5d3a29">&#9670;&nbsp;</a></span>correlation() <span class="overload">[4/7]</span></h2>

<div class="memitem">
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          <td class="memname">text correlation </td>
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<a id="a79c79a64e2145e640e410d8ebae078f7"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a79c79a64e2145e640e410d8ebae078f7">&#9670;&nbsp;</a></span>correlation() <span class="overload">[5/7]</span></h2>

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<h2 class="memtitle"><span class="permalink"><a href="#a703be245d20fa6ac1cc1ae433f08c4eb">&#9670;&nbsp;</a></span>correlation() <span class="overload">[6/7]</span></h2>

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<a id="ad81ac0ea4b9675fe257b2f5c2cee385e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ad81ac0ea4b9675fe257b2f5c2cee385e">&#9670;&nbsp;</a></span>correlation() <span class="overload">[7/7]</span></h2>

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          <td>(</td>
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<h2 class="memtitle"><span class="permalink"><a href="#a1c3081444f6bafc88a9b377f2af32968">&#9670;&nbsp;</a></span>correlation_agg()</h2>

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          <td class="memname">aggregate float8 [] correlation_agg </td>
          <td>(</td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname">[], </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname">[]&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a85a1a9b0ae5e608fd235f08ae01ff966">&#9670;&nbsp;</a></span>correlation_final()</h2>

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          <td class="memname">float8 [] correlation_final </td>
          <td>(</td>
          <td class="paramtype">float8 []&#160;</td>
          <td class="paramname"><em>state</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
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<h2 class="memtitle"><span class="permalink"><a href="#ac53cf4dd28185715a1798176bce44b1b">&#9670;&nbsp;</a></span>correlation_merge()</h2>

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          <td class="memname">float8 [] correlation_merge </td>
          <td>(</td>
          <td class="paramtype">float8 []&#160;</td>
          <td class="paramname"><em>left_state</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8 []&#160;</td>
          <td class="paramname"><em>right_state</em>&#160;</td>
        </tr>
        <tr>
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<h2 class="memtitle"><span class="permalink"><a href="#ae6223d0ba3e2b8a2d298ee78a293be6a">&#9670;&nbsp;</a></span>correlation_transition()</h2>

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          <td class="memname">float8 [] correlation_transition </td>
          <td>(</td>
          <td class="paramtype">float8 []&#160;</td>
          <td class="paramname"><em>state</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8 []&#160;</td>
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        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8 []&#160;</td>
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        <tr>
          <td></td>
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<h2 class="memtitle"><span class="permalink"><a href="#afee4f63248d2030dbc7ee37697e3c7e1">&#9670;&nbsp;</a></span>covariance() <span class="overload">[1/7]</span></h2>

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          <td class="memname">text covariance </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>source_table</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>output_table</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>target_cols</em>, </td>
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          <td class="paramkey"></td>
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          <td class="paramname"><em>verbose</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
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          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>grouping_cols</em>, </td>
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        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">integer&#160;</td>
          <td class="paramname"><em>n_groups_per_run</em>&#160;</td>
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<h2 class="memtitle"><span class="permalink"><a href="#ab2b75724c8361482265991e13f0f34e9">&#9670;&nbsp;</a></span>covariance() <span class="overload">[2/7]</span></h2>

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          <td class="memname">text covariance </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>source_table</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>output_table</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>target_cols</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">boolean&#160;</td>
          <td class="paramname"><em>verbose</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>grouping_cols</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
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<h2 class="memtitle"><span class="permalink"><a href="#aa962df7076b6a57914e766c8ab4fea78">&#9670;&nbsp;</a></span>covariance() <span class="overload">[3/7]</span></h2>

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          <td class="memname">text covariance </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>source_table</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>output_table</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>target_cols</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">boolean&#160;</td>
          <td class="paramname"><em>verbose</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="#a63aaa72fa4a4003a4b92b0b46eb69e00">&#9670;&nbsp;</a></span>covariance() <span class="overload">[4/7]</span></h2>

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          <td class="memname">text covariance </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>source_table</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>output_table</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>target_cols</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="#ada9ca243ead62cda1ec4faf8940e9b52">&#9670;&nbsp;</a></span>covariance() <span class="overload">[5/7]</span></h2>

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          <td class="memname">text covariance </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>source_table</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>output_table</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
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<h2 class="memtitle"><span class="permalink"><a href="#a986c54ff5cc92d3d530b494a8ee6f112">&#9670;&nbsp;</a></span>covariance() <span class="overload">[6/7]</span></h2>

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          <td class="memname">text covariance </td>
          <td>(</td>
          <td class="paramtype">text&#160;</td>
          <td class="paramname"><em>input_message</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
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<h2 class="memtitle"><span class="permalink"><a href="#a3ef3717dbd8916187ea111b933a52470">&#9670;&nbsp;</a></span>covariance() <span class="overload">[7/7]</span></h2>

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          <td class="memname">text covariance </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
          <td></td>
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<h2 class="memtitle"><span class="permalink"><a href="#a5c4f4adaf75fe3406bf1d0a20f8512ac">&#9670;&nbsp;</a></span>covariance_agg()</h2>

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          <td class="memname">aggregate float8 [] covariance_agg </td>
          <td>(</td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname">[], </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname">[]&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
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