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A Brief Tutorial on Maxent By Steven J. Phillips, AT&T Research This tutorial gives a basic introduction to use of the MaxEnt program for maximum entropy modelling of speciesÕ geographic distributions, written by Steven Phillips, Miro Dudik and Rob Schapire, with support from AT&T Labs -Research, Princeton University, and the Center for Biodiversity and Conservation, American Museum of Natural History. For more details on the theory behind maximum entropy modeling as well as a description of the data used and the main types of statistical analysis used here, see: Steven J. Phillips , Robert P. Anderson and Robert E. Schapire , Maximum entropy modeling of species geographic distributions . Ecological Modelling , Vol 190/3 -4 pp 231 -259, 2006. Two additional papers describing more recently -added features of the Maxent software are : Steven J. Phillips and Miroslav Dudik , Modeling of species distributions with Maxent: new extensions and a comprehensive evaluation . Ecography , Vol 31, pp 161 -175, 2008. Steven J. Phillips, et al. Opening the bl ack box: an open -source release of Maxent. Ecography, In press , 2017 . The environmental data we will use consist of climatic and elevational data for South America, together with a potential vegetation layer. Our sample species will be Bradypus variegatus , the brown -throated three -toed sloth. These data derive from the 2001 Anderson & Handley taxonomic revision (biostor.org/reference/84876 ) and were used in the Phillips et al. 2006 paper. This tutorial will assume that all the data files are located in the same directory as the maxent program files; otherwise you will need to use the path (e.g., c: \data \maxent \tutorial) in front of the file names used here. If you would like to reference th is tutorial in a publication, report, or online post , an appropriate citation is: Phillips, S. J. 201 7. A Brief Tutorial on Maxent. Available from url: biodiversityinformatics.amnh.org/open_source/maxen t/. Accessed on XXXX-XX-XX. Getting started Downloading The software consists of a jar file, maxent.jar, which can be used on any computer running Java version 1.4 or later. Maxent can be downloaded, along with associated literature, from biodiversityinformatics.amnh.org/open_source/maxent/ ; the Java runtime environ ment can be obtained from java.sun.com/javase/downloads . If you are using Microsoft Windows (as we assume here), you should also download the file maxent.bat, and save it in the same directory as maxent .jar. The website has a file called Òreadme.txtÓ, which contains instructions for installing the program on your computer.
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