\HeaderA{pbc}{Mayo Clinic Primary Biliary Cirrhosis Data}{pbc}
\keyword{datasets}{pbc}
\begin{Description}\relax
Followup of 312 randomised and 108 unrandomised patients
with primary biliary cirrhosis, a rare autoimmune liver disease, at
Mayo Clinic. Most variables have some missing data, coded as -9.
\end{Description}
\begin{Usage}
\begin{verbatim}data(pbc)\end{verbatim}
\end{Usage}
\begin{Format}\relax
\Tabular{ll}{
age:& in years\\
alb:& serum albumin\\
alkphos:& alkaline phosphotase\\
ascites:& presence of ascites\\
bili:& serum bilirunbin\\
chol:& serum cholesterol\\
edema:& presence of edema\\
edtrt:& 0 no edema, 0.5 untreated or successfully treated\\
& 1 unsuccessfully treated edema\\
hepmeg:& enlarged liver\\
time: & survival time\\
platelet:& platelet count\\
protime:& standardised blood clotting time\\
sex:& 1=male\\
sgot:& liver enzyme (now called AST)\\
spiders:& blood vessel malformations in the skin\\
stage:& histologic stage of disease (needs biopsy)\\
status:& censoring status\\
trt:& 1/2/-9 for control, treatment, not randomised\\
trig:& triglycerides\\
copper:& urine copper\\
}
\end{Format}
\begin{Source}\relax
Fleming TR, Harrington DP. "Counting Processes and Survival Analysis" Wiley:New York
\end{Source}