Dear R-help mailing list,
Kindly help me out with this problem:
I have a dataset that is in the format below,
ID time Y Age
1 0 195 23.1
1 2 204 23.3
1 4 202 23.5
2 0 170 22.0
2 3 234 22.2
3 0 208 24.4
3 2 194 24 .7
3 3 204 24.9
I wish to remove all the measurements at time point 0 and convert them to a
baseline variable as follows;
ID time Y Age baseline
1 2 204 23.3 195
1 4 202 23.5 195
2 3 234 22.2 170
3 2 194 24 .7 208
3 3 204 24.9 208
Thanks.
regards
John
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