HURDLE COUNT DATA MODELS IN RECREATION DEMAND ANALYSIS

When a sample of recreators is drawn from the general population using a survey, many in the sample will not recreate at a recreation site o f interest. This study focuses on nonparticipation in recreation deman d modeling and the use of modified count-data models. We clarify the m eaning of the single-hurdle Poisson (SHP) model and derive the double- hurdle Poisson (DHP) model. The latter is contrasted with the SHP and we show how the DHP is consistent with Johnson and Kotz's zero-modifie d Poisson model.