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\rho = 1-\bigg(\frac{6\sum(\Delta R)^2}{n(n^2-1)}\bigg)\frac{\sum_{i=1}^{n} R(x_{i})R(y_{i}) - n(\frac{n+1}{2})^{2}}{\sqrt{\sum_{i=1}^{n} R(x_{i})^{2} - n(\frac{n+1}{2})^{2}}\sqrt{\sum_{i=1}^{n} R(y_{i})^{2} - n(\frac{n+1}{2})^{2}}} |

**Use, advantages and disadvantages of rank order correlation**

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