4. Conclusions
It is shown that the limitation, pointed out by Garg and Kumar [1] in the existing correlation coefficients\(\left(1\right)-\left(3\right)\), is also occurring in the correlation coefficients \(\left(5\right)-\left(8\right)\). Also, it is pointed out that more computational efforts are required to apply in the existing correlation coefficients\(\left(5\right)-\left(8\right)\) as compared to the correlation coefficients \(\left(1\right)-\left(3\right)\).