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The Stanford University Heart Transplant Study was conducted to determine whether an experimental heart transplant program increased lifespan. Each patient entering the program was designated officially a heart transplant candidate, meaning that he was gravely ill and would most likely benefit from a new heart. Then the actual heart transplant occurs between a few weeks to several months depending on the availability of a donor. Very few candidates during this waiting period show improvement and get \emph{deselected

Variables:

• id - ID number of the patient.

• acceptyear - Year of acceptance as a heart transplant candidate.

• age - Age of the patient at the beginning of the study.

• survived - Survival status with levels alive and dead.

• survtime - Number of days patients were alive after the date they were determined to be a candidate for a heart transplant until the termination date of the study

• prior - Whether or not the patient had prior surgery with levels yes and no.

• transplant - Transplant status with levels control (did not receive a transplant) and treatment (received a transplant).

• wait - Waiting Time for Transplant

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Source

http://www.stat.ucla.edu/~jsanchez/data/stanford.txt

as a heart transplant candidate, but for the purposes of this experiment those patients were kept in the data as continuing candidates.}

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