Household
vaccine demand is a non-negative integer value and the number of vaccines demanded
(dependent variable) can be estimated as a function of vaccine price, efficacy, household perceptions
of dengue severity and likelihood, as well as household socio-economic characteristics.
Count models are suitable for our household demand analysis because the count model estimates
non-negative integer values and specifies the quantity demanded with a mean that is dependent
on exogenous variables[13,21]