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Table 2 Logit P. juliflora as a source of income model: maximum likelihood result (response variable, Y = 1 if a household uses P. juliflora as a source of income, Y = 0 otherwise)

From: The invasion of Prosopis juliflora and Afar pastoral livelihoods in the Middle Awash area of Ethiopia

Explanatory variable Coefficient Std. error Marginal effect
Age of household head −0.045 0.023a −0.010
Primary school dummy (1 = yes, 0 = no) −0.002 0.534 −0.001
Polygamy status (1 = yes, 0 = no) 0.657 0.742 0.152
Family size −0.095 0.104 −0.022
Livestock asset 0.018 0.018 0.004
Change in livestock asset −0.011 0.006a −0.003
Division in which household is located (reference is Worer)    
Amibara (1 = yes, 0 = no) 0.541 0.713 0.126
Awash Arba (1 = yes, 0 = no) 0.552 0.671 0.128
Halaideghe (1 = yes, 0 = no) −1.461 0.865a −0.339
Gewane (1 = yes, 0 = no) 1.169 0.666a 0.271
Sideha-Faghe (1 = yes, 0 = no) −0.337 0.783 −0.078
Constant 1.481 0.993a 0.344
Number of observations   142  
LR(G)   20.83a  
Log likelihood   −63.36  
  1. Marginal effect shows a change in probability in using P. juliflora as a source of income for a unit change in an explanatory variable
  2. aSignificant at 5 %