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. 2011 May 12;6(5):e19416. doi: 10.1371/journal.pone.0019416

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Voorman et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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In this scenario the data is generated according to , independent of . Both the model-based and robust standard errors are valid estimates of variability, as demonstrated by the QQ-plot.

Inline graphic — In this scenario the data is generated according to , independent of . Both the model-based and robust standard errors are valid estimates of variability, as demonstrated by the QQ-plot.