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• W2113185710 abstract "Sightability models are binary logistic-regression models used to estimate and adjust for visibility bias in wildlife-population surveys (Steinhorst and Samuel 1989). Estimation proceeds in 2 stages: (1) Sightability trials are conducted with marked individuals, and logistic regression is used to estimate the probability of detection as a function of available covariates (e.g., visual obstruction, group size). (2) The fitted model is used to adjust counts (from future surveys) for animals that were not observed. A modified Horvitz-Thompson estimator is used to estimate abundance: counts of observed animal groups are divided by their inclusion probabilites (determined by plot-level sampling probabilities and the detection probabilities estimated from stage 1). We provide a brief historical account of the approach, clarifying and documenting suggested modifications to the variance estimators originally proposed by Steinhorst and Samuel (1989). We then introduce a new R package, SightabilityModel, for estimating abundance using this technique. Lastly, we illustrate the software with a series of examples using data collected from moose (Alces alces) in northeastern Minnesota and mountain goats (Oreamnos americanus) in Washington State." @default.
• W2113185710 created "2016-06-24" @default.
• W2113185710 creator A5030821429 @default.
• W2113185710 date "2012-01-01" @default.
• W2113185710 modified "2023-09-23" @default.
• W2113185710 title "Estimating Population Abundance Using Sightability Models:<i>R</i><b>SightabilityModel</b>Package" @default.
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• W2113185710 doi "https://doi.org/10.18637/jss.v051.i09" @default.
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