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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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The top row displays the results for logistic regression, and the bottom for proportional hazards. The data was simulated according to and with half of the data censored at the median survival time. The top left shows the log odds of an event, which demonstrates non-linearity that was not specified in the model. The plot on the lower left displays a loess curve through the Schoenfeld residuals from the regression of Y on E. A non-zero slope is indicative of violation of the proportional hazards assumption.

Inline graphic — The top row displays the results for logistic regression, and the bottom for proportional hazards. The data was simulated according to and with half of the data censored at the median survival time. The top left shows the log odds of an event, which demonstrates non-linearity that was not specified in the model. The plot on the lower left displays a loess curve through the Schoenfeld residuals from the regression of Y on E. A non-zero slope is indicative of violation of the proportional hazards assumption.