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Spearman's rank| In statistics, an index of the strength of the relationship between two sets of information; for example, altitude and temperature. The value of the index varies between +1 (a perfect positive correlation) and −1 (a perfect negative correlation); 0 = no correlation. |
| R = 1 − (6 × Σd2)/(n3 − n) |
| where n is the number of pairs of data and d is the difference in rank. |
| As a first step to investigate correlation, a scatter diagram can be plotted, to see how near to a straight line the points lie. |
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