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All possible subsets regression.
| Predictor set | R2 |
|---|---|
| X1 | 0.250 |
| X2 | 0.000 |
| X3 | 0.063 |
| X1, X2 | 0.275 |
| X1, X3 | 0.267 |
| X2, X3 | 0.067 |
| X1, X2, X3 | 0.301 |
Predictor contribution is determined by researcher judgment. The model with the highest R2 value, but with the most ease of interpretation, is typically chosen.
