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. 2015 Aug 6;34(30):3949–3967. doi: 10.1002/sim.6602

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© 2015 The Authors. Statistics in Medicine Published by John Wiley & Sons Ltd.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Ratio of mean estimated standard error to empirical standard deviation of the estimated log‐hazard ratio. NNM, nearest neighbor matching; IPTW, inverse probability of treatment weighting; ATT, average effect of treatment in the treated.