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Activity Number: 190 - Contributed Poster Presentations: Section on Statistics and the Environment
Type: Contributed
Date/Time: Monday, July 29, 2019 : 10:30 AM to 12:20 PM
Sponsor: Section on Statistics and the Environment
Abstract #304419
Title: Some Results on Use-Availability Models for Presence-Only Data from Multiple Species
Author(s): Nels Johnson*
Companies: US Forest Service, Pacific Southwest Research Station
Keywords: species distribution models; use-availability; point process; logistic regression; generalized nonlinear models

In ecological studies of species distributions we often only have data about where a species is present in space, but not where it is absent. How to correctly address this problem depends on a number of issues. Some examples: Are species locations at points (e.g. plants) or polygons (e.g. large animals)? What link function are you assuming? Are there multiple species? How large should my background sample be? We will address some issues with the size of background samples for use-availability models, as well as generalize this result and some other results such as inference on odds ratios from single species models to multiple species models.

Authors who are presenting talks have a * after their name.

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