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?

	[[alternative HTML version deleted]]

