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Re: st: summarizing data across rows (e.g as in time use files)


From   Adeel Yousaf <townplanneradeel@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: summarizing data across rows (e.g as in time use files)
Date   Mon, 11 Mar 2013 16:24:05 +0800

thanks Rebecca. you are right, i need to perform travel behavior
analysis e.g. average. no. of trips and modes of travel; so i need
activity blocks with start and end time. andi need to use 'tsspell'
but it is not working as i have panel data for 39000+ persons, and
number of rows are not same across persons and each row is showing
half hour duration at maximum,  and the 'tsspell' command generates
following error.

. tsset  person  starttime
repeated time values within panel
r(451);

please help

On Sun, Mar 10, 2013 at 12:17 PM, Rebecca Pope <rebecca.a.pope@gmail.com> wrote:
> If you want when the activity started, just add
>
> (min) starttime
>
> to the code that Nick already gave you.
>
> It isn't clear to me why you would want to keep the start time though
> if you are calculating duration for the whole activity since people
> could start & stop, then restart some time later. Perhaps you should
> also check out -tsspell- (by Nick Cox, available from SSC), which will
> divide your activities up into continuous blocks. Eg. if a person
> sleeps for 30 minutes in the afternoon and then goes to bed again in
> the evening and sleeps 6 hours, that would be treated as two different
> episodes & you could have the "starttime" for each.
>
> Regards,
> Rebecca
>
> On Sat, Mar 9, 2013 at 9:39 PM, Adeel Yousaf <townplanneradeel@gmail.com> wrote:
>> Thanks, its good but not good enough for the purpose. after performing
>> as u suggested, 'starttime' variable is lost, which reflects when
>> activity started. If i collapse by 'starttime', it does not totals
>> 'duration'. please share your thoughts,
>>
>> On Sat, Mar 9, 2013 at 4:36 PM,  <njcoxstata@gmail.com> wrote:
>>> -help collapse-
>>>
>>> collapse (sum) duration, by(person code)
>>>
>>> or something similar.
>>>
>>> Sent from my iPad
>>>
>>> On 9 Mar 2013, at 03:54, Adeel Yousaf <townplanneradeel@gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> I have episode file of time use showing population's activity code and
>>>> duration. In this data, an activity longer than 30 mins (e.g. sleep)
>>>> has multiple episodes, that creates unrealistically larger number of
>>>> activities in one day. I want to keep one record per activity if the
>>>> code is repeated in next row and generate combine duration for that
>>>> activity. for example, code '11' has been repeated in three
>>>> episodes/rows, but it should be in one row with duration=90, how can i
>>>> do that!
>>>>
>>>> person  starttime       episode duration        code
>>>> 1       11/25/2007 4:00 1       30      11
>>>> 1       11/25/2007 4:30 2       30      11
>>>> 1       11/25/2007 5:00 3       30      11
>>>> 1       11/25/2007 5:30 4       15      30
>>>> 1       11/25/2007 5:45 5       15      60
>>>> 1       11/25/2007 6:00 6       30      60
>>>> 1       11/25/2007 6:30 7       30      60
>>>> 1       11/25/2007 7:00 8       15      413
>>>> 1       11/25/2007 7:15 9       15      412
>>>> 1       11/25/2007 7:30 10      30      412
>>>> 1       11/25/2007 8:00 11      15      412
>>>> 1       11/25/2007 8:15 12      15      20
>>>> 1       11/25/2007 8:30 13      15      413
>>>> 1       11/25/2007 8:45 14      15      413
>>>> 1       11/25/2007 9:00 15      30      413
>>>>
>>>>
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>>
>>
>>
>> --
>> Muhammad Adeel
>> Room 841 A, ,8F. Knowles building
>> Department of Urban Planning and Design
>> The University of Hong Kong
>> Pokfulam road, Hong Kong SAR
>> Cell: 0085254894670
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-- 
Muhammad Adeel
Room 841 A, ,8F. Knowles building
Department of Urban Planning and Design
The University of Hong Kong
Pokfulam road, Hong Kong SAR
Cell: 0085254894670
*
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*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/


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