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Table 8 Recursive mixed-process model estimates, third specification with the concentration index

From: IITA’s genebank, cowpea diversity on farms, and farmers’ welfare in Nigeria

Explanatory variable Third specification
Concentration index (dc) Anc
Endogenous variable
 Anc − 0.066*** (0.025)
Household characteristics
 Age 0.000 (0.003)
 Sex − 0.138 (0.140)
 Education − 0.002 (0.019)
 Education2   − 0.001 (0.001)
 Household size − 0.002*** (0.001)
 Need credit − 0.189*** (0.066)
 Experience 0.998*** (0.202)
Farm characteristics
 Size − 0.003** (0.001)
 Slope − 0.007** (0.003)
 Distance to farm − 0.000 (0.000)
 Soil fertility 0.400*** (0.105)
Market characteristics
 Distance to seed dealer 0.000 (0.000)
 Distance to village market 0.000 (0.001)
 Distance to district market 0.001 (0.000)
Geographical zone
 North East − 0.004 (0.007) − 0.245*** (0.071)
 Constant 0.232*** (0.013) − 0.927*** (0.285)
 Prob > chi2 0.000
 N 1559
  1. Column 1 is a tobit regression with the concentration index as dependent variable. Column 2 is a probit regression with genebank ancestry as dependent variable. Standard errors are in parentheses. ***,**,*: estimates are statistically significant at 1, 5, or 10% significance level, respectively