Variables | Model 1 | Model 2 | Model 3 |
---|---|---|---|
Instrument: distance to plot (hour) | − 0.776*** (0.266) | − 0.263 (0.173) | |
Log of fertilizer used (kg/ha) | 0.228*** (0.037) | 0.646*** (0.093) | |
Residual from first stage | − 0.451*** (0.092) | ||
Head’s gender (female = 1) | − 0.597** (0.244) | − 0.026 (0.152) | 0.193 (0.173) |
Head’s age (years) | 0.009 (0.007) | − 0.009** (0.005) | − 0.013*** (0.005) |
Head’s education (illiterate = 1) | − 0.689*** (0.207) | 0.146 (0.140) | 0.471*** (0.152) |
Family size (number) | 0.169** (0.067) | 0.126*** (0.044 | − 0.086 (0.055) |
Male adult (number) | 0.189** (0.098) | − 0.046 (0.065) | − 0.106 (0.058) |
Female adult (number) | 0.202** (0.107) | − 0.0698 (0.071) | 0.193** (0.173) |
Access to irrigation (yes = 1) | 0.502*** (0.149) | 0.451*** (0.128) | |
Rainfall of production season | 0.033 (0.021) | 0.024 (0.033) | |
Constant | 3.601*** (1.390) | 6.641*** (1.38) | 6.698*** (2.177) |
Crop fixed effect | Yes | Yes | Yes |
Plot characteristics | Yes | Yes | Yes |
District fixed effect | Yes | Yes | Yes |
R2 | 0.2249 | 0.2404 | |
Left censored observation | 186 | ||
Uncensored observation | 440 | ||
Prob > chi2 | 0.000 | 0.0000 | 0.0000 |
Total observation | 626 | 626 | 626 |