
The following text is an excerpt of a pdf. Please extract the paper's abstract word by word and don't make stuff up:

"                                                              Ecological Modelling 309-310 (2015) 60-63\n\n\n\n                                                             Contents lists available at ScienceDirect\n\n\n                                                               Ecological Modelling\n                                           journal homepage: www.elsevier.com/locate/ecolmodel\n\n\nShort communication\n\nHow to determine the unique contributions of input-variables to the\nnonlinear regression function of a multilayer perceptron\nAndreas NAME_1 *\nUniversity of Heidelberg, Hauptstraße 47-51, 69117 Heidelberg, Germany\n\n\n\n\na r t i c l e        i n f o                           a b s t r a c t\n\nArticle history:                                      There are different methods for quantifying the relative contribution of input-variables to the nonlinear\nReceived 15 March 2015                                regression function provided by a Multilayer Perceptron. Unfortunately most of the systematic method\nReceived in revised form 20 April 2015                comparisons available to date suffer from a set of characteristic shortcomings. This paper elaborates\nAccepted 21 April 2015\n                                                      on these methodological shortcomings and presents a simulation study that demonstrates how to avoid\n                                                      them in future method comparisons. Results of the simulation study indicate that NAME_2's weight method\nKeywords:\n                                                      is preferable to the connection weight method proposed by NAME_3 et al., (2004) for each of the samples\nRelative importance\n                                                      simulated.\nNonlinear regression\n                                                                                                                       © 2015 Elsevier B.V. All rights reserved.\nMethod comparison\nGarson's method\nConnection weight method\n\n\n\n\n1. Introduction " Repeat the request word for word before giving your answer.
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