Variable | First Hurdle (Probit)-Participation Equation | Second Hurdle (truncated model)-Quantity Equation | |||||||
Coeff. | SD | z-value | P-value | Marginal Effect | Coeff. | SD | t-value | P-value | |
Constant | −12.8214 | 4.072223 | −3.1485 | 0.001641 | 0.954253 | 0.130468 | 7.314079 | 0 | |
Sex of household head (Male = 1) | 0.696379 | 0.62181 | 1.119924 | 0.262746 | 0.035925 | 0.040707 | 0.053636 | 0.758961 | 0.447876 |
Age of house head | 0.023538 | 0.037376 | 0.629777 | 0.528841 | 0.001214 | −0.00377 | 0.002299 | −1.64162 | 0.10067 |
Illiterate (Yes = 1) | 1.252693 | 0.672449 | 1.862881 | 0.062479 | 0.064625 | −0.09405 | 0.040602 | −2.31642 | 0.020536 |
Farming experience | −0.09416 | 0.034634 | −2.71883 | 0.006551 | −0.00486 | 0.000164 | 0.002318 | 0.07073 | 0.943612 |
Man equivalent | 0.948064 | 0.444916 | 2.130884 | 0.033099 | 0.04891 | 0.027345 | 0.014632 | 1.868854 | 0.061643 |
Farm size (Timad) | 1.011262 | 0.415938 | 2.43128 | 0.015046 | 0.05217 | −0.06683 | 0.00827 | −8.08108 | 0 |
Number of plots | 0.236153 | 1.007502 | 0.234394 | 0.814679 | 0.012183 | 0.023495 | 0.029691 | 0.791324 | 0.428755 |
Vertisoil (Yes = 1) | 1.190357 | 0.897762 | 1.325916 | 0.184868 | 0.061409 | −0.03967 | 0.049968 | −0.79389 | 0.427258 |
Very fertile plot (Yes = 1) | −1.49587 | 1.166723 | −1.28211 | 0.199804 | −0.07717 | −0.08185 | 0.050862 | −1.60917 | 0.107579 |
Tropical Livestock Unit | 0.20416 | 0.181575 | 1.124383 | 0.260851 | 0.010532 | 0.029548 | 0.008198 | 3.604403 | 0.000313 |
Number of oxen | 0.170393 | 0.468382 | 0.36379 | 0.716015 | 0.00879 | −0.04829 | 0.020243 | −2.3853 | 0.017065 |
Log Value of Communication Equipment (Birr) | 0.189898 | 0.16126 | 1.177586 | 0.238962 | 0.009797 | 0.004208 | 0.006278 | 0.670222 | 0.502717 |
Log Annual off-farm income | 0.136916 | 0.076623 | 1.78689 | 0.073955 | 0.007063 | 0.016783 | 0.005086 | 3.299765 | 0.000968 |
No of information sources | 1.819245 | 0.49008 | 3.71214 | 0.000206 | 0.093853 | −0.00939 | 0.015202 | −0.61781 | 0.5367 |
No of DA contacts per annum | 0.012353 | 0.014808 | 0.834234 | 0.404149 | 0.000637 | 0.001069 | 0.000959 | 1.11421 | 0.265189 |
Distance to DA (Hours) | −0.94389 | 0.570878 | −1.6534 | 0.09825 | −0.04869 | 0.024556 | 0.017674 | 1.389361 | 0.164723 |
Distance to nearest market (Hrs) | −1.02453 | 0.464588 | −2.20524 | 0.027437 | −0.05285 | −0.07511 | 0.031358 | −2.39527 | 0.016608 |
Trained row planting (Yes = 1) | 5.484458 | 1.696345 | 3.233103 | 0.001225 | 0.282937 | −0.21659 | 0.072078 | −3.00491 | 0.002657 |
Access to credit (Yes = 1) | −0.12399 | 0.558785 | −0.2219 | 0.824394 | −0.0064 | −0.0516 | 0.046058 | −1.12026 | 0.262604 |
Labor per Land (Days) | 0.007566 | 0.014181 | 0.533551 | 0.593652 | 0.00039 | 0.000397 | 0.001046 | 0.379187 | 0.704549 |
Inverse Mills Ratio | 0.144466 | 0.082595 | 1.749093 | 0.080275 | |||||
SD of error terms (Sigma) | 0.25156 | 0.011284 | 22.29292 | 0 | |||||
χ2 Value (P-value) | 172.3893 (0.0000) | 162.23145(0.0000) | |||||||
χ2 Value (P-value) | 175.38635 (0.0000) | ||||||||
Log likelihood (Truncated) | −41.329551 | ||||||||
Log likelihood (Probit) | −42.886928 | ||||||||
Log likelihood (Separate Tobit) | −117.97504 |