What is the difference between the product moment correlation coefficient and Spearma

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jojo55
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#1
Hi .

What is the difference between the product moment correlation coefficient and Spearman's rank correlation coefficient?

They both provide an answer that is between -1 and 1 and shows the strength of correlation.

Why use one over the other?

Thanks
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username1474628
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Report 5 years ago
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(Original post by jojo55)
Hi .

What is the difference between the product moment correlation coefficient and Spearman's rank correlation coefficient?

They both provide an answer that is between -1 and 1 and shows the strength of correlation.

Why use one over the other?

Thanks
If you have data that is not originally in a numerical form then you will have to use Spearman'd rank. Firstly you'd rank each variable from 1 to n and then calculate the square of the differences between the two ranks. This result can be used in a similar way to PMCC. PMCC is applicable for parameters where data is numerical, eg height of a a student against age.
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