Dear R-help mailing list,
 
I have this problem, I have a joint  longitudinal and survival data of the form say
 
ID Time Failuretime Censoringind longitudinalmeasure
1  0     35                  0                123
1  10    35                 0                 120 
1   25   35                 1                   123
2   0    23                  0                   100
2   10  23                  0                   111
 
 
I wish to create a new dataset such that only the first measurement is included.
 
Also, i will appreciate if there is a function that i could call to do this because I will be applying it too in a simulation settings.
 
Thank you for your time.
 
James.                


      
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