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Write the formula for calculating correlation.

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Write the formula for calculating correlation.

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1. Karl Pearson’s coefficient of correlation

r = \(\cfrac{\sum xy}{\sqrt{\sum x^2\times \sum y^2}}\)

2. Spearman's Rank correlation Coefficient

R = 1 - \(\cfrac{6\sum D^2}{N(N^2-1)}\)

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