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. 2013 Apr 23;8(4):e61623. doi: 10.1371/journal.pone.0061623

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Analysis of the NLA Data. The two panels contain the number of selected predictor variables (averaged over 100 bootstrap samples) for various modeling approaches. Dark grey bars represent linear effects, light grey bars represent non-linear effects. In case of beta regression with fixed precision parameter (“beta fix”), the precision model contains only one predictor (namely, the intercept).