# Statistics/Testing Data/Spearmans

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**Spearman Rank- Correlation coefficient**

Spearman developed a method of measuring rank correlation known as spearman rank correlation coefficient. It is generally denoted by r_{s}. There are three cases while calculating Spearman rank correlation coefficient:

*Case i* When ranks are given

*Case ii* When ranks are not given

*Case iii* Repeated ranks

The formula for calculating Spearman rank correlation coefficient is same for case i and ii. The formula is,

```
```

Where,

n = The number of items or individuals being ranked

d =

= The rank of items with respect to first variable

= The rank of items with respect to second variable