[CONF] Apache Lucene Mahout > PearsonCorrelation

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Space: Apache Lucene Mahout (http://cwiki.apache.org/confluence/display/MAHOUT)
Page: PearsonCorrelation (http://cwiki.apache.org/confluence/display/MAHOUT/PearsonCorrelation)

Added by Sean Owen:
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The Pearson correlation measures the degree to which two series of numbers tend to move together -- values in corresponding positions tend to be high together, or low together. In particular it measures the strength of the linear relationship between the two series, the degree to which one can be estimated as a linear function of the other. It is often used in collaborative filtering as a similarity metric on users or items; users that tend to rate the same items high, or low, have a high Pearson correlation and therefore are "similar".

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