Wrong userSimilarity and itemSimilarity centeredSumXY formula/computation

[Shem Cristobal]

Has anyone seen this line 235 (and line 313) of AbstractSimilarity.class?

double centeredSumXY = sumXY - meanY * sumX;

This is so wrong and should be replaced by

double centeredSumXY = sumXY - meanY * meanX;



Best regards,

@shemcristobal