Illustration of Rank Correlation Coefficient

Sometimes numerical data such refers to the quantifiable variables may be described after which a rank correlation coefficient may be worked out.

Is such a condition, the rank correlation coefficient will be determined after the described variables have been converted into ranks. See the given illustration:

∴ Rank correlation r = 1 - {(6Σd²)/ (n (n² -1))}

 = 1 -   {(6(43.5))/(10(10² -1))}

 = 1 -  (261/990)

= 0.74 as High positive correlation among mathematics marks and accounts