Short note on Spearman rank correlation

Dear student 

sometimes we are given a series of items where no numerical measure can be made , but where best and worst can be identified.
rankings are often applied in these situations to put the series into an oder , example :- the characteristics like beauty , intelligence , leadership ability , honesty , etc . cannot be measured numerically , but can be ranked. so based on this spearman discovered a formula to know the correlation between qualitative things . 
                                                     p = (1- ∑D2) / n(n2- 1 )


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A rank correlation is any of several statistics that measure an ordinal association?the relationship between rankings of different ordinal variables or different rankings of the same variable, where a "ranking" is the assignment of the ordering labels "first", "second", "third", etc. to different ................?
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