nwtco {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

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))

[Package survival version 2.31 Index]