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  "Title": "Evaluation of Failure Time Surrogate Endpoints in Individual\nPatient Data Meta-Analyses",
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  "Description": "Provides functions for the evaluation of surrogate\nendpoints when both the surrogate and the true endpoint are\nfailure time variables. The approaches implemented are: (1) the\ntwo-step approach (Burzykowski et al, 2001)\n<DOI:10.1111/1467-9876.00244> with a copula model (Clayton,\nPlackett, Hougaard) at the first step and either a linear\nregression of log-hazard ratios at the second step (either\nadjusted or not for measurement error); (2) mixed proportional\nhazard models estimated via mixed Poisson GLM (Rotolo et al,\n2017 <DOI:10.1177/0962280217718582>).",
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