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Table 3 Probit model estimates of the determinant of membership in fisher group

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

MEMBERSHIP

Unmatched sample

Matched sample

Probit coefficients

Marginal effects

Probit coefficients

Marginal effects

AGE

0.01

(0.01)

0.00

(0.00)

0.01

(0.01)

0.00

(0.00)

EXPERIENCE

0.03**

(0.01)

0.01**

(0.00)

0.03**

(0.01)

0.01**

(0.00)

EDUCYEAR

0.04*

(0.02)

0.01*

(0.01)

0.04*

(0.02)

0.01*

(0.01)

REPEAT

ā€‰āˆ’ā€‰0.34

(0.35)

ā€‰āˆ’ā€‰0.08

(0.08)

ā€‰āˆ’ā€‰0.34

(0.35)

ā€‰āˆ’ā€‰0.08

(0.08)

FEMLABSHR

ā€‰āˆ’ā€‰0.13*

(0.07)

ā€‰āˆ’ā€‰0.03*

(0.02)

ā€‰āˆ’ā€‰0.13*

(0.07)

ā€‰āˆ’ā€‰0.03*

(0.02)

FEMAS

0.71***

(0.21)

0.17***

(0.05)

0.70***

(0.21)

0.16***

(0.05)

AKWA-IBOM

ā€‰āˆ’ā€‰1.07***

(0.37)

ā€‰āˆ’ā€‰0.25***

(0.08)

ā€‰āˆ’ā€‰1.06***

(0.37)

ā€‰āˆ’ā€‰0.25***

(0.09)

ONDO

ā€‰āˆ’ā€‰1.01***

(0.23)

ā€‰āˆ’ā€‰0.24***

(0.05)

ā€‰āˆ’ā€‰1.01***

(0.23)

ā€‰āˆ’ā€‰0.24***

(0.05)

MOBILE

0.28

(0.32)

0.07

(0.08)

0.28

(0.32)

0.07

(0.08)

EXTENSION

0.38

(0.47)

0.09

(0.11)

0.37

(0.50)

0.09

(0.12)

CREDIT

0.21

(0.23)

0.05

(0.05)

0.19

(0.23)

0.05

(0.05)

CUSTOMERS

ā€‰āˆ’ā€‰0.11**

(0.05)

ā€‰āˆ’ā€‰0.03**

(0.01)

ā€‰āˆ’ā€‰0.11**

(0.05)

ā€‰āˆ’ā€‰0.03**

(0.01)

SHOCK

ā€‰āˆ’ā€‰0.15

(0.23)

ā€‰āˆ’ā€‰0.04

(0.05)

ā€‰āˆ’ā€‰0.15

(0.23)

ā€‰āˆ’ā€‰0.04

(0.05)

TAROAD

0.73**

(0.30)

0.17**

(0.07)

0.72**

(0.30)

0.17**

(0.07)

LEADER

ā€‰āˆ’ā€‰0.34

(0.29)

ā€‰āˆ’ā€‰0.08

(0.07)

ā€‰āˆ’ā€‰0.33

(0.29)

ā€‰āˆ’ā€‰0.08

(0.07)

COOP

0.55**

(0.26)

0.13**

(0.06)

0.54**

(0.26)

0.13**

(0.06)

EXTENSION residual

0.16

(0.27)

Ā 

0.17

(0.28)

Ā 

CREDIT residual

ā€‰āˆ’ā€‰0.04

(0.35)

Ā 

0.03

(0.36)

Ā 

Constant

ā€‰āˆ’ā€‰1.50**

(0.60)

Ā 

ā€‰āˆ’ā€‰1.49**

(0.61)

Ā 

Log-likelihood

ā€‰āˆ’ā€‰149.15

Ā 

ā€‰āˆ’ā€‰148.72

Ā 

LR chi2(18)

112.86

Ā 

105.77

Ā 

Number of obs

353

Ā 

350

Ā 
  1. ***pā€‰<ā€‰0.01, **pā€‰<ā€‰0.05, *pā€‰<ā€‰0.1. The parameters in the model were estimated using Eq.Ā (13). Standard errors are presented in parentheses
  2. Source: Authorsā€™ calculation based on survey data