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Donovan, T. M., and M. Alldredge. 2007. Exercises in Estimating and Monitoring Abundance. <http://www.uvm.edu/envnr/vtcfwru/spreadsheets/abundance/abundance.htm> Chapter 13 - Royle-Nichols Abundance-Induced Heterogeneity Models. How can you determine abundance of animals across a study area, given only detection - nondetection data? It almost seems impossible, but Andy Royle and Jim Nichols figured it out. This model takes detection - nondetection data across R different study sites, each repeated T different times, to find the maximum likelihood estimate of species detection probability and mean animal abundance across the study area. The total population size (N) and the proportion of sites that are occupied (y) are derived parameters. This exercise was developed and written in collaboration with Kurt Rinehart at the University of Vermont.
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