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st: time series graph showing cumulative frequency


From   Adeel Yousaf <townplanneradeel@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: time series graph showing cumulative frequency
Date   Wed, 20 Mar 2013 09:56:17 +0800

Hi Statalist,
Thanks for previous reply regarding summarizing activity duration.
Another problem for me, I want to generate a time series graph showing
cumulative frequency of a given categorical variable across time in
panel dataset. e.g. in table below how many persons at a time engage
in an activity "11" across time (at 4 am, 5 am, 6 am ...and so on)?

id	start	end	activity
100003	4:00	4:30	11
100003	4:30	5:00	12
100003	5:00	5:30	13
100003	5:30	5:45	11
100004	5:45	6:00	12
100004	6:00	6:30	13
100004	6:30	7:00	11
100004	7:00	7:15	12
100005	7:15	7:30	13
100005	7:30	8:00	11
100005	8:00	8:15	16
100005	8:15	8:30	13
100005	8:30	8:45	11

thanks
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