This is a simulated surival data set for investigating random center effects. To make it realistic, the number of centers and their sizes is based on an EORTC cancer trial.

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A data frame with 2323 observations on the following 4 variables.

`y`

survival time

`uncens`

0=alive, 1=dead

`center`

enrolling center, a number from 1 to 37

`trt`

treatment arm, 0 or 1

This is used in the test suite for the code.

PhD thesis work of Jose Cortinas Abrahantes

Cortinas Abrahantes, Jose; Burzykowski, Tomasz (2002), A version of the EM algorithm for proportional hazards models with random effects , Published in: Lecture Notes of the ICB Seminars. p. 15-20

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