rhDNase and Recurrent Pulmonary Infections
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Description of Variables:

id      patient ID
trt     1 = rhDNase; 0 = placebo
fev     forced respiratory volume measured at randomization
fev2    forced respiratory volume measured after randomization
time1   start time of an interval
time2   stop time of an interval
status  1 = event; 0 = censored
etype   1 = onset of an exacerbation; 2 = resolution of an exacerbation
enum    cumulative number of lines for each individual
enum1   cumulative number of exacerbation-free periods
enum2   cumulative number of exacerbation periods


References:

Therneau TM and Grambsch PM (2000).
Modeling Survival Data: Extending the Cox Model.
Springer, New York, NY.

Cook RJ and Lawless JF (2007).
The Statistical Analysis of Recurrent Events.
Springer. New York, NY.


> rhDNase <- read.table("rhDNase.dat", header=T)

> length(unique(rhDNase$id))
  [1] 645

> dim(rhDNase)
  [1] 1326   11

> rhDNase[1:12,]                                                                        

       id trt  fev fev2 time1 time2 status etype enum enum1 enum2
1  493301   1 28.8 28.1     0   168      0     1    1     1     0
2  493303   1 64.0 63.0     0   169      0     1    1     1     0
3  493305   0 67.2 68.7     0    65      1     1    1     1     0
4  493305   0 67.2 68.7    65    75      1     2    2     1     1
5  493305   0 67.2 68.7    75   168      0     1    3     2     1
6  493309   1 57.6 56.5     0   168      0     1    1     1     0
7  493310   0 57.6 56.3     0   171      0     1    1     1     0
8  493311   1 25.6 25.3     0   166      0     1    1     1     0
9  493312   0 86.4 85.4     0   168      0     1    1     1     0
10 493313   0 32.0 32.4     0    90      1     1    1     1     0
11 493313   0 32.0 32.4    90   104      1     2    2     1     1
12 493313   0 32.0 32.4   104   166      0     1    3     2     1