Correlation Coefficient Calculator
www.calculators.org › math › correlationSep 25, 2019 · Here is the correlation co-efficient formula used by this calculator. Correlation (r) = NΣXY - (ΣX) (ΣY) / Sqrt ( [NΣX2 - (ΣX)2] [NΣY2 - (ΣY)2]) Formula definitions. N = number of values or elements in the set. X = first score. Y = second score. ΣXY = sum of the product of both scores. ΣX = sum of first scores. ΣY = sum of second scores.