| Regression [1] | Regression [2] | Regression [3] | Coef. equality testb | |||||||
| Entire sample | Lowland | Upland | ||||||||
| Variables | Coef. | p > |z| | Coef. | p > |z| | Coef. | p > |z| | χ2 | |||
| log (seed) | 0.274 | 0.000 | 0.249 | 0.000 | 0.367 | 0.000 | 1.30 | |||
| log (fertilizer) | 0.014 | 0.050 | 0.021 | 0.054 | ||||||
| Family size | 0.017 | 0.008 | 0.020 | 0.011 | ||||||
| Head’s age | −0.004 | 0.020 | −0.004 | 0.063 | ||||||
| Small farmers | 0.144 | 0.001 | 0.101 | 0.071 | 0.192 | 0.003 | 1.12 | |||
| Variety: Supa | 0.142 | 0.021 | −0.645 | 0.032 | ||||||
| Kaiso/other lowland | 0.196 | 0.001 | ||||||||
| BMR days: 1st month | −0.280 | 0.000 | −0.291 | 0.000 | −0.251 | 0.002 | 0.16 | |||
| 2nd month | −0.076 | 0.000 | −0.073 | 0.029 | −0.083 | 0.000 | 0.05 | |||
| 3rd month | 0.092 | 0.000 | 0.129 | 0.000 | 0.079 | 0.001 | 2.33 | |||
| Intercept | 32.33 | 0.000 | 12.58 | 0.000 | 12.54 | 0.000 | 0.00 | |||
| log | −1.748 | 0.000 | −4.063 | 0.000 | −1.852 | 0.000 | ||||
| log | −0.977 | 0.000 | −1.248 | 0.000 | −1.985 | 0.000 | ||||
| LR-test (σu = 0) | 200.0 | 0.000 | 90.37 | 0.000 | 94.94 | 0.000 | ||||
| log likelihood | −1072 | −595.3 | −462.7 | |||||||
| AIC | 2171 | 1211 | 945.3 | |||||||
| TE (Mean, SD) | 0.622 | 0.198 | 0.654 | 0.177 | 0.602 | 0.212 | ||||
| N | 1028 | 596 | 432 | |||||||
