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Table 7 Maximum likelihood estimates of determinants of technical inefficiency

From: Correcting for sample selection in stochastic frontier analysis: insights from rice farmers in Northern Ghana

Variable Irrigation only Rainfed only Pooled
Coef. Std. Err. Coef. Std. Err. Coef. Std. Err.
Const. 2.542 0.792 − 5.15a 0.981 − 1.552a 0.479
Age − 0.038b 0.016 0.057 0.016 0.014 0.009
Sex − 1.005a 0.366 1.916 0.459 0.656a 0.237
HH head − 0.218 0.315 − 0.734 0.299 − 0.54a 0.194
Education 0.055a 0.021 − 0.018b 0.026 − 0.002 0.015
Commercial − 1.467a 0.283 − 0.221 0.24 − 0.579a 0.163
Experience − 0.002 0.021 − 0.078a 0.021 − 0.042a 0.012
Location −0.722b 0.368 1.886a 0.436 0.631a 0.222
FBO − 0.565c 0.311 − 0.432 0.287 0.052 0.177
Subsidy − 0.31 0.375 − 0.869a 0.285 − 0.713a 0.179
Training − 0.273 0.376 0.731a 0.278 0.112 0.184
Credit 0.553 0.508 0.465 0.332 0.575b 0.246
CC perception − 0.064 0.378 0.83a 0.264 0.344c 0.187
HH size 0.006b 0.022 0.035 0.021 0.046a 0.015
Log-likelihood 5.77   − 160.88   − 318.61  
N 223 315 538
  1. a, b and c represent 1%, 5% and 10% level of significance respectively
  2. Source: Field data, 2017