When is it necessary to use the rank correlation ? - Vidyadip

Question

When is it necessary to use the rank correlation ?

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Answer

Spearman’s rank correlation is used in the following cased
$(a)$ When given data cannot be represented in the numerical from, i.e when ranks are given according to their magnitudes.
$(b)$ When dispersion is more or when the extreme observation are present in the data of two correlated variables.

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