A species' distribution can be characterized by the probability that it occurs at some location in space. Estimating occurrence probability can be easily accomplished using presence-absence data, but often researchers only have presence locations and environmental data for the study area. MAXENT is a popular software program for modeling species distributions, but it does not estimate the probability of occurrence. Rather, it returns various indices that are not easy to interpret (see Royle et al. 2012). Package "maxlike" provides a simple likelihood-based alternative.
This function estimates the probability of occurrence using presence-only data and spatially-referenced covariates. Species distribution maps can be created by plotting the expected values of occurrence probability. The model is described by Royle et al. (2012).
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