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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. ***pā€‰<ā€‰0.01, **pā€‰<ā€‰0.05, *pā€‰<ā€‰0.1
  2. Source: Authorsā€™ calculation based on survey data