Estimated Parameters of Propensity Score for the Lalonde Experimental Data
| Variable | Estimated | (Standard Error) |
|---|---|---|
| Intercept | −3.48 | (0.10) |
| Preselected linear terms | ||
| Earn ’74 | 0.03 | (0.05) |
| Unemployed ’74 | −0.24 | (0.39) |
| Earn ’75 | 0.06 | (0.05) |
| Unemployed ’75 | −3.48 | (1.65) |
| Additional linear terms | ||
| No degree | 7.33 | (4.25) |
| Hispanic | −0.65 | (0.39) |
| Education | 0.29 | (0.37) |
| Second-order terms | ||
| No degree × education | −0.67 | (0.35) |
| Earn ’74 × no degree | −0.13 | (0.06) |
| Unemployed ’75 × education | 0.30 | (0.16) |