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Propensity score matching quality test.
| Extension access | Cooperative membership | |
|---|---|---|
| Pseudo R2 before matching | 0.044 | 0.061 |
| Pseudo R2 after matching | 0.004 | 0.01 |
| LRχ2 (p-value) before matching | 123.87 (p>χ2 = 0.000) | 142.99 (p>χ2 = 0.000) |
| LRχ2 (p-value) after matching | 8.17 (p>χ2 = 0.698) | 15.06 (p>χ2 = 0.238) |
| Mean standardized bias before matching | 13.6 | 11.5 |
| Mean standardized bias after matching | 2.8 | 6.0 |
