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Table 7 Predicted frontier output for unmatched and matched samples

From: Can producer groups improve technical efficiency among artisanal shrimpers in Nigeria? A study accounting for observed and unobserved selectivity

SPF models Pooled Members Nonmembers Technical change (%) Test of means
Unmatched conventional
Mean 57,130.00 64,790.39 54,309.31 19.30 2.64***
Unmatched sample selection
Mean 56,215.70 60,056.17 54,801.57 9.59 1.36*
Matched conventional
Mean 57,388.27 66,022.27 54,309.31 21.57 2.90***
Matched sample selection
Mean 56,542.66 61,302.06 54,845.51 11.77 1.64*
  1. ***p < 0.01, **p < 0.05, *p < 0.1
  2. Source: Authors’ calculation based on survey data