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Table 6 Recursive mixed-process model estimates, first specification with the richness index

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

Explanatory variable First specification
Richness index (dr) Anc
Endogenous variable
 Anc 0.293 (0.357)
Household characteristics
 Age − 0.001 (0.003)
 Sex − 0.119 (0.144)
 Education 0.011 (0.019)
 Education2   − 0.001 (0.001)
 Household size − 0.017* (0.010)
 Need credit − 0.157** (0.067)
 Experience 1.030*** (0.204)
Farm characteristics
 Size − 0.232*** (0.019)
 Slope 0.593*** (0.047)
 Distance to farm 0.004** (0.002)
 Soil fertility 0.379*** (0.107)
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 − 0.443*** (0.099) − 0.253*** (0.071)
 Constant 2.444*** (0.187) − 0.951*** (0.293)
 Prob > chi2 0.000
 N 1557
  1. Column 1 is a tobit regression with the richness 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