data on the number of fish caught
(i.e. count denotes number of fish caught) by visitors to a national
park. Some of the visitors do not fish, but we do not have the data on
whether a person fished; we merely have data on how many fish each
visitor caught. We also have data on whether a visitor was camping
at the park (i.e. camper = 1 if visitor camped, camper = 0 otherwise), whether a visitor used live bait while fishing (i.e. livebait = 1
if visitor uses live bait, livebait = 0 otherwise) and the number of
persons accompanying the visitor in their visit to their park (i.e.
persons = 1 if visitor came alone; persons = 2 if one to two persons accompanied the visitor; persons = 3 if three or more persons
accompanied the visitor).
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