Three way k -fold cross-validation of resource selection functions

Three way k -fold cross-validation of resource selection functions A resource selection function (RSF) yields a prediction that is proportional to the probability of use of a resource unit by an organism. Because many apparently adequate models fail in new areas or time periods we developed a method for model selection and evaluation based on the model’s ability to predict generally, spatially, and temporally. This work is an extension of previous work using k -fold cross-validation to evaluate models developed using presence-only study designs. A RSF model’s utility is its ability to predict, so this method is applicable to any RSF model regardless of study design. The use and application of our proposed 3-way evaluation using the RSF Plot Index (RPI) statistic is illustrated using survey data of grassland birds, Landsat imagery, soil data, and a Digital Elevation Model from the Canadian Forces Base Suffield in southeastern Alberta. The sensitivity of the RPI statistic to the number and placement of bins is addressed and a method is presented to ameliorate this problem. The 3-way method provides the means to not only select the model with the best predictive power, but to understand the limitations of all models under consideration. Test results of best models using an independent field season are presented. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecological Modelling Elsevier

Three way k -fold cross-validation of resource selection functions

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Publisher
Elsevier
Copyright
Copyright © 2006 Elsevier B.V.
ISSN
0304-3800
eISSN
1872-7026
DOI
10.1016/j.ecolmodel.2007.10.005
Publisher site
See Article on Publisher Site

Abstract

A resource selection function (RSF) yields a prediction that is proportional to the probability of use of a resource unit by an organism. Because many apparently adequate models fail in new areas or time periods we developed a method for model selection and evaluation based on the model’s ability to predict generally, spatially, and temporally. This work is an extension of previous work using k -fold cross-validation to evaluate models developed using presence-only study designs. A RSF model’s utility is its ability to predict, so this method is applicable to any RSF model regardless of study design. The use and application of our proposed 3-way evaluation using the RSF Plot Index (RPI) statistic is illustrated using survey data of grassland birds, Landsat imagery, soil data, and a Digital Elevation Model from the Canadian Forces Base Suffield in southeastern Alberta. The sensitivity of the RPI statistic to the number and placement of bins is addressed and a method is presented to ameliorate this problem. The 3-way method provides the means to not only select the model with the best predictive power, but to understand the limitations of all models under consideration. Test results of best models using an independent field season are presented.

Journal

Ecological Modelling – Elsevier

Published: Apr 10, 2008

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