Rank correlation coefficient is obtained by following the formula.
A. $$1 - \frac{{\sum {D^2}}}{{{N^3} - N}}$$
B. $$\frac{{6\sum {D^2}}}{{N\left( {{N^3} - N} \right)}}$$
C. $$1 - \frac{{6\sum {D^2}}}{{N\left( {{N^2} - 1} \right)}}$$
D. $$1 + \frac{{6\sum {D^2}}}{{N\left( {{N^3} - N} \right)}}$$
Answer: Option C
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