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| Quality of Statistical Control | Covariate | Repeated Measures or GLM (4) | ||
|---|---|---|---|---|
| Quality of Match | None (1) | Distal (2) | Proximal (3) | |
| All promoted or matched on non-academic variable (1) | 1 | 1 | 2 | 2 |
| Low achieving promoted students (2) | 1 | 1 | 2 | 3 |
| Matched on academic ability or achievement (3) | 2 | 2 | 3 | 3 |
Note.
Quality of Control - 1: Low; 2: Medium; 3: High.
