Data supplied by Dr Joanna Briggs (University of Leeds, UK)

   Records from 1292 school-children 
in Derbyshire, UK, of whom
   216 are Asthma cases. A partial analysis, concerning the variation
   
in asthma risk wih distance from three point sources and from the
   nearest point of the main 
road network, is reported in:

     
   DIGGLE, P.J. and ROWLINGSON, B.S. (1994).  A conditional approach
 to point process modelling 
   of raised incidence. J.R.Statist.Soc. 
A 157, 433-440.

   
The data are stored as text-file with varialble names in the first row.
To access within R, use
 the command:
 read.table("asthma.txt",header=T)