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Table 5 Estimates of Cobb-Douglas stochastic frontier

From: Effects of climate adaptation on technical efficiency of maize production in Northern Ghana

Variable Coef. Std. Err. P>z
Output model
 Farm size 0.625*** 0.06 0.000
 Hired labor − 0.103*** 0.026 0.000
 Family labor 0.098** 0.045 0.031
 Seed 0.470*** 0.055 0.000
 Chemical 0.189*** 0.035 0.000
 Fertilizer 0.003 0.031 0.928
 Adaptation 0.150*** 0.048 0.002
 Constant 3.706 0.115 0.000
Inefficiency model
 Planting date 3.345 2.18 0.125
 Early maturing variety 1.679 1.101 0.127
 Drought-resistant variety 3.573** 1.778 0.044
 Crop rotation − 4.959** 2.139 0.02
 Land rotation 1.124 1.009 0.265
 Mixed farming 0.382 1.024 0.709
 Intercropping 0.956 0.895 0.285
 Refilling − 0.324 0.799 0.685
 CA 1.911** 0.931 0.04
 ISFM 2.846** 1.379 0.039
 Mulching 2.689* 1.6 0.093
 Row planting − 4.752** 1.956 0.015
 IPM − 1.759 1.356 0.194
 Contour farming − 0.479 1.084 0.658
 Age 0.063 0.046 0.174
 Education 0.213** 0.103 0.039
 Home-farm 0.329 0.207 0.113
 Extension − 1.399 1.075 0.193
 Farmer groups − 2.993* 1.655 0.071
 Credit access 2.006 1.41 0.155
 Constant − 13.44 5.729 0.019
 Sigma (v) 0.593 0.017  
 RTS 1.431   
  1. *Statistically significant at 10%
  2. **Statistically significant at 5%
  3. ***Statistically significant at 1%