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Hi,
If this is what you mean...
http://en.wikipedia.org/wiki/Coefficient_of_determination
Then this might be what you are after
If this is what you mean...
http://en.wikipedia.org/wiki/Coefficient_of_determination
Then this might be what you are after
<operator name="RegressionPerformance" class="RegressionPerformance">
<parameter key="main_criterion" value="squared_correlation"/>
<parameter key="skip_undefined_labels" value="false"/>
<parameter key="use_example_weights" value="false"/>
</operator>
If this is not correct, please provide a link or an explanation.