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Agricultural and Food Economics
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Table 4 Conventional and selection SPF based on unmatched observation

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 5.568*** 0.756 5.011*** 0.000 5.615*** 0.917 5.92418*** 0.4524 4.96669*** 0.667
Value_fertilizer 0.003*** 0.001 0.003*** 0.000 0.003*** 0.001 .00267*** 0.0003 .00406*** 0.001
Value_seed 0.558*** 0.173 0.579*** 0.000 0.572*** 0.212 .40810*** 0.0964 .72837*** 0.152
Value_labor 0.012 0.023 0.076*** 0.000 − 0.003 0.030 .05214*** 0.0098 − 0.00711 0.029
Land_maize 0.410** 0.174 0.315*** 0.000 0.415* 0.212 .49672*** 0.1002 .25527* 0.152
Off_farm − 0.002 0.015         
Sigma 0.091*** 0.007 0.033*** 0.005 0.106*** 0.010     
Sigma(u)        .21502*** 0.0033 .42371*** 0.014
Sigma(v)        .01373** 0.0059 .04182*** 0.012
Rho(w,v)        .96882*** 0.0905 − 0.40401 1.579
  1. *Significance at 10% level
  2. **Significance at 5% level
  3. ***Significance at 1% level
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