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| <a href="correlation_8sql__in.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* ----------------------------------------------------------------------- */</span><span class="comment">/**</span></div> |
| <div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * @file correlation.sql_in</span></div> |
| <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * @brief SQL functions for correlation computation</span></div> |
| <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * @date April 2013</span></div> |
| <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * @sa For a brief introduction to correlation, see the</span></div> |
| <div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * module description \ref grp_correlation</span></div> |
| <div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> */</span><span class="comment">/* ----------------------------------------------------------------------- */</span></div> |
| <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div> |
| <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> m4_include(`SQLCommon.m4<span class="stringliteral">')</span></div> |
| <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="stringliteral"></span></div> |
| <div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="stringliteral"></span><span class="comment"></span></div> |
| <div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">/**</span></div> |
| <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">@addtogroup grp_correlation</span></div> |
| <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">@about</span></div> |
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">A correlation function is the degree and direction of association of two</span></div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">variables; how well can one random variable be predicted from the other. The</span></div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">coefficient of correlation varies from -1 to 1. Coefficient of 1 implies perfect</span></div> |
| <div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">correlation, 0 means no correlation, and -1 means perfect anti-correlation.</span></div> |
| <div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">This function provides a cross-correlation matrix for all pairs of numeric</span></div> |
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">columns in a <em>source_table</em>. A Correlation matrix describes correlation</span></div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">among \f$ M \f$ variables. It is a square symmetrical \f$ M \f$x \f$M \f$ matrix</span></div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">with the \f$ (ij) \f$th element equal to the correlation coefficient between the</span></div> |
| <div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">\f$i\f$th and the \f$j\f$th variable. The diagonal elements (correlations of</span></div> |
| <div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">variables with themselves) are always equal to 1.0.</span></div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">@usage</span></div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">Currently the correlation function can be used in the following way:</span></div> |
| <div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">@verbatim</span></div> |
| <div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">SELECT {schema_madlib}.correlation</span></div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">(</span></div> |
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> source_table TEXT, -- Source table name (Required)</span></div> |
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> output_table TEXT, -- Output table name (Required)</span></div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> target_cols TEXT, -- Comma separated columns for which summary is desired</span></div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> -- (Default: NULL - produces result for all columns)</span></div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">)</span></div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">@endverbatim</span></div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">Output will be a table with N+2 columns and N rows, where N is the number of</span></div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">target columns.</span></div> |
| <div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">- column_position: The first column provides position of the variable in</span></div> |
| <div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> the '<em>source_table</em>'</span></div> |
| <div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment">- variable: The second column gives the row-header for each</span></div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> variable</span></div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment">The rest of the table is the NxN correlation matrix for all pairs of</span></div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment">numeric columns in `<em>source_table</em>'.</span></div> |
| <div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment">The output table is arranged as a lower-traingular matrix with the upper</span></div> |
| <div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">triangle set to NULL and the diagonal elements set to 1.0. To obtain the result</span></div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">from the '<em>output_table</em>' in this matrix format ensure to order the</span></div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">elements using the '<em>column_position</em>', as given in the example below.</span></div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">@verbatim</span></div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">sql> SELECT * FROM output_table order by column_position;</span></div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">@endverbatim</span></div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">@examp</span></div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment">@verbatim</span></div> |
| <div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment">DROP TABLE IF EXISTS example_data;</span></div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment">CREATE TABLE example_data(</span></div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> id SERIAL,</span></div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> outlook text,</span></div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> temperature float8,</span></div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> humidity float8,</span></div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> windy text,</span></div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> class text) ;</span></div> |
| <div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('sunny', 85, 85, 'false', E'Don\\'t Play');</span></div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('sunny', 80, 90, 'true', E'Don\\'t Play');</span></div> |
| <div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('overcast', 83, 78, 'false', 'Play');</span></div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('rain', 70, 96, 'false', 'Play');</span></div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('rain', 68, 80, 'false', 'Play');</span></div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('rain', 65, 70, 'true', E'Don\\'t Play');</span></div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('overcast', 64, 65, 'true', 'Play');</span></div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('sunny', 72, 95, 'false', E'Don\\'t Play');</span></div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('sunny', 69, 70, 'false', 'Play');</span></div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('rain', 75, 80, 'false', 'Play');</span></div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('sunny', 75, 70, 'true', 'Play');</span></div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('overcast', 72, 90, 'true', 'Play');</span></div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('overcast', 81, 75, 'false', 'Play');</span></div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('rain', 71, 80, 'true', E'Don\\'t Play');</span></div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES(' ', 100, 100, 'true', ' ');</span></div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment">INSERT INTO example_data(outlook, temperature, humidity, windy, class) VALUES('', 110, 100, 'true', '');</span></div> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"></span></div> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment">SELECT madlib.correlation('example_data', 'example_data_output');</span></div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment">SELECT madlib.correlation('example_data', 'example_data_output', '*');</span></div> |
| <div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment">SELECT madlib.correlation('example_data', 'example_data_output', 'temperature, humidity');</span></div> |
| <div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment">@endverbatim</span></div> |
| <div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment">To get the correlation matrix from output table:</span></div> |
| <div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment">@verbatim</span></div> |
| <div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> SELECT * from example_data_output order by column_position;</span></div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment">@endverbatim</span></div> |
| <div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment">*/</span></div> |
| <div class="line"><a name="l00104"></a><span class="lineno"> 104</span> </div> |
| <div class="line"><a name="l00105"></a><span class="lineno"> 105</span> DROP TYPE IF EXISTS MADLIB_SCHEMA.correlation_result;</div> |
| <div class="line"><a name="l00106"></a><span class="lineno"> 106</span> CREATE TYPE MADLIB_SCHEMA.correlation_result AS</div> |
| <div class="line"><a name="l00107"></a><span class="lineno"> 107</span> (</div> |
| <div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  output_table TEXT,</div> |
| <div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  row_count INT4,</div> |
| <div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  duration FLOAT8</div> |
| <div class="line"><a name="l00111"></a><span class="lineno"> 111</span> );</div> |
| <div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div> |
| <div class="line"><a name="l00113"></a><span class="lineno"> 113</span> -----------------------------------------------------------------------</div> |
| <div class="line"><a name="l00114"></a><span class="lineno"> 114</span> -- Main function for correlation</div> |
| <div class="line"><a name="l00115"></a><span class="lineno"> 115</span> -----------------------------------------------------------------------</div> |
| <div class="line"><a name="l00116"></a><span class="lineno"> 116</span> /* @brief Compute a correlation matrix for a table with optional target columns specified</div> |
| <div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div> |
| <div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  @param source_table Name of source relation containing the data</div> |
| <div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  @param output_table Name of output table name to store the correlation</div> |
| <div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  @param target_cols String with comma separated list of columns for which cross-correlation is desired</div> |
| <div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div> |
| <div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  @usage</div> |
| <div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <pre> SELECT MADLIB_SCHEMA.correlation (</div> |
| <div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  '<em>source_table</em><span class="stringliteral">', '</span><em>output_table</em><span class="stringliteral">',</span></div> |
| <div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="stringliteral"> '</span><em>target_cols</em><span class="stringliteral">'</span></div> |
| <div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="stringliteral"> );</span></div> |
| <div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="stringliteral"> SELECT * FROM '</span><em>output_table</em><span class="stringliteral">' order by '</span><em>colum_position</em><span class="stringliteral">';</span></div> |
| <div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="stringliteral"> </pre></span></div> |
| <div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="stringliteral">*/</span></div> |
| <div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="stringliteral">CREATE FUNCTION MADLIB_SCHEMA.correlation(</span></div> |
| <div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="stringliteral"> source_table VARCHAR, -- input table name</span></div> |
| <div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="stringliteral"> output_table VARCHAR, -- output table name</span></div> |
| <div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="stringliteral"> target_cols VARCHAR -- comma separated list of output cols</span></div> |
| <div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="stringliteral"> -- (default = '</span>*<span class="stringliteral">')</span></div> |
| <div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="stringliteral">)</span></div> |
| <div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="stringliteral">RETURNS MADLIB_SCHEMA.correlation_result AS $$</span></div> |
| <div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="stringliteral"> PythonFunctionBodyOnly(`stats'</span>, `correlation<span class="stringliteral">')</span></div> |
| <div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="stringliteral"> return correlation.correlation(schema_madlib, source_table, output_table, target_cols)</span></div> |
| <div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="stringliteral">$$ LANGUAGE plpythonu VOLATILE;</span></div> |
| <div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="stringliteral"></span></div> |
| <div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="stringliteral">-----------------------------------------------------------------------</span></div> |
| <div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="stringliteral">-- Overloaded function</span></div> |
| <div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="stringliteral">-----------------------------------------------------------------------</span></div> |
| <div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="stringliteral">CREATE FUNCTION MADLIB_SCHEMA.correlation(</span></div> |
| <div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="stringliteral"> source_table VARCHAR, -- input table name</span></div> |
| <div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="stringliteral"> output_table VARCHAR -- output table name</span></div> |
| <div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="stringliteral">)</span></div> |
| <div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="stringliteral">RETURNS MADLIB_SCHEMA.correlation_result AS $$</span></div> |
| <div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="stringliteral"> select MADLIB_SCHEMA.correlation($1, $2, NULL)</span></div> |
| <div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="stringliteral">$$ LANGUAGE sql;</span></div> |
| <div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="stringliteral"></span></div> |
| <div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="stringliteral">-----------------------------------------------------------------------</span></div> |
| <div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="stringliteral">-- Help functions</span></div> |
| <div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="stringliteral">-----------------------------------------------------------------------</span></div> |
| <div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="stringliteral">CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.correlation(</span></div> |
| <div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="stringliteral"> input_message TEXT</span></div> |
| <div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="stringliteral">)</span></div> |
| <div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="stringliteral">RETURNS TEXT AS $$</span></div> |
| <div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="stringliteral"> PythonFunctionBodyOnly(`stats'</span>, `correlation<span class="stringliteral">')</span></div> |
| <div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="stringliteral"> return correlation.correlation_help_message(schema_madlib, input_message)</span></div> |
| <div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="stringliteral">$$ LANGUAGE plpythonu;</span></div> |
| <div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="stringliteral"></span></div> |
| <div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="stringliteral"></span></div> |
| <div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="stringliteral">CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.correlation()</span></div> |
| <div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="stringliteral">RETURNS TEXT AS $$</span></div> |
| <div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="stringliteral"> PythonFunctionBodyOnly(`stats'</span>, `correlation<span class="stringliteral">')</span></div> |
| <div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="stringliteral"> return correlation.correlation_help_message(schema_madlib, None)</span></div> |
| <div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="stringliteral">$$ LANGUAGE plpythonu;</span></div> |
| <div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="stringliteral">-------------------------------------------------------------------------</span></div> |
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