Description Usage Format Details Source References Examples
Data are taken from Loomis (2003). The study relates to a survey taken on reported frequency of visits to national parks during the year. The survey was taken at park sites, thus incurring possible effects of endogenous stratification.
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A data frame with 410 observations on the following 11 variables.
anvisits
number of annual visits to park
gender
1=male;0=female
income
income in US dollars per year, categorical: 4 levels
income1
<=$25000
income2
>$25000 - $55000
income3
>$55000 - $95000
income4
>$95000
travel
travel time, categorical: 3 levels
travel1
<.25 hrs
travel2
>=.25 - <4 hrs
travel3
>=4 hrs
loomis is saved as a data frame. Count models typically use anvisits as response variable. 0 counts are included
from Loomis (2003)
Hilbe, Joseph M (2007, 2011), Negative Binomial Regression, Cambridge University Press Loomis, J. B. (2003). Travel cost demand model based river recreation benefit estimates with on-site and household surveys: Comparative results and a correction procedure, Water Resources Research, 39(4): 1105
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