CASE STUDIES IN BIOMETRY: Chapter 18.

Modeling the Precursors of Cervical Cancer

Allison J. Kirby, David J.Spiegelhalter

These data remain the copyright of the Harris Birthright Research Unit
of the University of Aberdeen, UK. It may be used freely for
non-commercial purposes and can be freely distributed provided its
source is acknowledged.

The file ch18a.dat contains the following individual-specific variables:

Variable                Coding
Control/patient code    0=control, 1=patient
Study number            1-500 for each group
Number of smears        1-15
Biopsy result           0=negative, 1=positive  
			9=missing (no biopsy)   
Number of days from     0-840 if biopsy done,   
last smear to biopsy    -1 if no biopsy