Experimental Lalonde Data: Estimates of Average Treatment Effects (standard errors in parentheses)
| Covariate | Full Sample | Trimmed Sample | ||||
|---|---|---|---|---|---|---|
| 1 Block | Match | 1 Block | 2 Blocks | 3 Blocks | Match | |
| Number | 1.79 (0.67) | 2.21 (0.82) | 1.69 (0.66) | 1.49 (0.68) | 1.48 (0.68) | 2.30 (0.81) |
| Few | 1.74 (0.67) | 2.15 (0.82) | 1.60 (0.66) | 1.54 (0.66) | 1.52 (0.68) | 2.26 (0.81) |
| All | 1.67 (0.64) | 2.11 (0.82) | 1.56 (0.65) | 1.56 (0.64) | 1.46 (0.65) | 2.26 (0.81) |