1. Cameron and Trivedi (2009) show that another way of interpreting the marginal effect of discrete variables is to exponentiate the coefficients (e β). One additional year in age is associated with the number of PA technologies decreasing by 1.02. The exponentiated coefficient of discrete variables applies to any Maximum Likelihood estimation (see Cameron and Trivedi 2009, pages 558–564).
2. RECENT DEVELOPMENTS IN COUNT DATA MODELLING: THEORY AND APPLICATION
3. Daberkow S.G. , and McBride W.D. 2000. “Adoption of Precision Agriculture Technologies by U.S. Farmers.” From the proceedings of the 5th International Conference on Precision Agriculture in Minneapolis, MN, July 16–19.
4. Statistical tests (t-test and Wald test) show that the coefficients on state dummies for Mississippi, Missouri, and Florida are statistically significant at the 5 percent level of significance. However, the Wald test also shows that the coefficients on state dummies for Mississippi and Missouri are not statistically different from one another.