Q2. Distinguish between the Spearman’s coefficient of rank correlation and Karl Pearson’s
coefficient of correlation. Explain the situations under which Spearman’s coefficient of rank
correlation can assume a maximum and a minimum value. Under what conditions will
spearman’s formula and Karl Pearson’s formula give equal results.
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Abdulvahed Khaledi Darvishan
Tarbiat Modares University
The Pearson correlation coefficient is the most widely used. It measures the strength of the linear relationship between normally distributed variables. When the variables are not normally distributed or the relationship between the variables is not linear, it may be more appropriate to use the Spearman rank correlation method.
There is a very interesting paper about the differences between these two correlation coefficients on the same sets of data:
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