[R] how to handle a longitudinal data

From: gallon li <gallon.li_at_gmail.com>
Date: Sat 27 Jan 2007 - 09:53:46 GMT


i have a data set with repeated measures on same people, structure like below:

id x1 x2 ...
001 10 20 ...
001 8 45 ...
001 4 2 ...
002 ....
002 ...
002 ....
002 ....

003 ....
.......

what is the easist way to show how many observations for each subject id?

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