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Agricultural and Food Economics
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Table 5 Conventional and selection SPF based on matched observations

From: Impact of off-farm activities on technical efficiency: evidence from maize producers of eastern Ethiopia

  Conventional SPF Selection
Pooled Participant Non-participant Participant Non-participant
Coef se Coef se Coef se Coef se Coef se
cons 4.407*** 1.173 5.011*** 0.000 3.459** 1.753 3.30277*** 0.41786 4.59917*** 1.44511
Value_fertilizer 0.003*** 0.001 0.003*** 0.000 0.003*** 0.001 .00466*** 0.00033 .00391*** 0.00058
Value_seed 0.839*** 0.275 0.579*** 0.000 1.092*** 0.414 1.00655*** 0.09091 .78095** 0.33539
Value_labor 0.002 0.023 0.076*** 0.000 −0.020 0.028 .05404*** 0.01047 0.01089 0.02271
Land_maize 0.131 0.273 0.315*** 0.000 −0.104 0.411 −0.08678 0.09178 0.17441 0.34022
Off_farm 0.002 0.015      .00169 .015266   
Sigma .29978*** 0.001 0.033*** 0.005 0.105*** 0.010     
Sigma(u)        .18861*** 0.0029 .35989*** 0.0098
Sigma(v)        .00973** 0.00449 .04921*** 0.0093
Rho(w,v)        .76645** 0.39002 .89504*** 0.33496
  1. *Significance at 10% level
  2. **Significance at 5% level
  3. ***Significance at 1% level
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