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Table 5 Es timates of the Stochastic Revenue Frontier and inefficiency model

From: Off-farm labour supply and production efficiency of farm household in rural Southwest Nigeria

  OLS estimates ML Estimates
Coefficient t-ratio Coefficient t-ratio
Conditional revenue frontier
Constant 1.6742 0.53 9.5649*** 7.21
LNPCAS 0.5010*** 2.78 0.1074 0.86
LNPMAIZE 0.3527* 1.79 0.2384 1.52
LNPYAM −0.4067** −2.16 −0.0534 −0.38
LNPEGGS 1.4744*** 3.57 0.2035 0.68
LNPPOIL 0.1742 0.74 0.4268** 2.71
LNCLAND 0.3815*** 9.42 0.7075*** 15.92
LNTLAND 0.1795*** 7.86 −0.0309 −0.79
LNANU 0.0595** 1.97 0.0836*** 3.82
LNFERT 0.0103 0.37 0.0286 1.57
LNTRACT 0.0667* 1.85 0.0370 1.47
LNMATCOS 0.0145* 1.66 0.0050 0.77
LNHRLAB 0.0264*** 2.98 0.0112** 2.05
LNADLAB 0.2326*** 3.28 0.1128*** 2.89
LNCHLAB 0.0272** 2.01 −0.0054 −0.48
Inefficiency equation
Constant    0.2696*** 4.31
GENDER    −0.0719 −0.98
NATIVITY    −0.0351 −0.85
HIGHEDU    −0.0012 −0.22
YOUTHFAC    0.0114 0.19
GENDERFA    −0.0482 −0.74
PTREE    −1.7265*** −7.43
PFREHOLD    0.1471*** 2.78
SIMPSON    0.2182*** 3.08
DISTANCE    0.0028 0.25
ASSETINC    −3.3e-7* −1.66
REMITTA    0.4257 0.95
LOANGOT    −6.8e-7 −1.27
POFFFARM    −0.1595*** −15.24
Sigma squared 0.2169   0.0661*** 9.43
Gamma    0.99*** 17702
Log likelihood function −129.73   −12.03  
LR test of one sided error    235.4  
  1. NOTE: ***, ** and * imply the associated coefficients are significant at 1%, 5% and 10% levels respectively.