There are four different forest site-type strata in our data. Day-use developed sites
(DUDS) include picnic sites, fish viewing sites, fishing sites, interpretive sites, observation sites,
playground-park sport sites, ski areas, some wildlife viewing sites, caves, visitor centers,
museums, and swimming areas. Overnight-use developed sites (OUDS) include campgrounds,
fire lookouts and cabins, hotels, lodges, and resorts, horse camps, organization sites, and any
other overnight developed sites within Forest Service jurisdiction, whether managed by the
agency or by a concessionaire. Wilderness (WILD) includes lands and waters that are part of the
National Wilderness Preservation System. General forest area (GFA) includes all of the residual
parts of a national forest not included in DUDS, OUDS, or WILD categories. Generally, sample
points for general forest area are at trailheads. A dummy variable indicating type of forest site at
which the respondent was interviewed (1 if interviewed at general forest site, 0 otherwise) was
added to the model.
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