nwtco                package:survival                R Documentation

Data from the National Wilm's Tumor Study

Description:

     Missing data/masurement error example. Tumor histology predicts
     survival, but prediction is stronger with central lab histology
     than with the local institution determination.

Usage:

     nwtco

Format:

     A data frame with 4028 observations on the following 9 variables.

     'seqno' id number

     'instit' Histology from local institution

     'histol' Histology from central lab

     'stage' Disease stage

     'study' study

     'rel' indicator for relapse

     'edrel' time to relapse

     'age' age in months

     'in.subcohort' Included in the subcohort for the example in the
          paper

Source:

     <URL: http://faculty.washington.edu/norm/software.html>

References:

     NE Breslow and N Chatterjee (1999), Design and analysis of
     two-phase studies with binary outcome applied to Wilms tumour
     prognosis. _Applied Statistics_ *48*, 457-68.

Examples:

     with(nwtco, table(instit,histol))
     anova(coxph(Surv(edrel,rel)~histol+instit,data=nwtco))
     anova(coxph(Surv(edrel,rel)~instit+histol,data=nwtco))

