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. 2022 Apr 23;24(3):776–794. doi: 10.1093/biostatistics/kxac006

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Fig. 1. — Boxplot of the estimates using distributed Cox regression, pooled Cox regression, and meta-analyses with simulated data of sample size with data generated from unstratified models. Sizes for the data-contributing sites are (left plot) or (right plot). Covariates distributions for all the data-contributing sites are different. True log HR value is . Number of replications = 10 000.

Inline graphic — Boxplot of the estimates using distributed Cox regression, pooled Cox regression, and meta-analyses with simulated data of sample size with data generated from unstratified models. Sizes for the data-contributing sites are (left plot) or (right plot). Covariates distributions for all the data-contributing sites are different. True log HR value is . Number of replications = 10 000.