Spearman Correlation ची गणना कशी करावी
Spearman Correlation म्हणजे काय?
Spearman's rank correlation (rs) measures the strength of the monotonic relationship between two variables using their ranks. It is the non-parametric equivalent of Pearson's r and is more robust to outliers.
चरण-दर-चरण मार्गदर्शक
- 1Rank each variable from 1 to n
- 2rs = 1 − (6Σd²) / (n(n²−1))
- 3d = difference in ranks for each pair
- 4Perfect rank agreement → rs=1; perfect reversal → rs=−1
Worked Examples
इनपुट
Two raters rank 5 items: d² values: 1,0,4,1,0
परिणाम
rs = 0.7 — moderate to strong rank correlation
1−6×6/(5×24)=0.7
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