st: Re:Question sent Prematurely by mistake

[Michael Stewart <michaelstewartresearch@gmail.com>]

Please disregard this post as it is send prematurely by  mistake.

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On Tue, Jan 7, 2014 at 1:52 AM, Michael Stewart
<michaelstewartresearch@gmail.com> wrote:
> Hello ,
>
> I have a question regarding lists and have read Nicks paper on lists
> and counting irregularly spaced intervals.
>
> I posted a similar, but different question
> http://www.stata.com/statalist/archive/2013-11/msg00882.html
> previously.
>
> My dataset is as follows
>
>
> ***********DATASET-BEGIN**************************
> ID       VISITDATE         EVENT              LOCATION
> 1             Jan_1             May_1                  1
> 1             Jan_4             May_1 2
> 1 Jan_6 May_1 1
> 1 May_5 May_1 1
> 1 May_8 May_1 2
> 2 Feb_2 Feb_9 2
> 2 Feb_6 Feb_9 2
> 2 Feb_15 Feb_9 1
> 2 Feb_27 Feb_9 2
> 2 Mar_30 Feb_9 2
>
> ***********DATASET_END****************************
>
>
> MY NEED:  I am trying to generate the following two variables and
> looking to see if the programmers in the statalist may help me.
>
> 1) ***** for this variable, can you suggest an shorter/more elegant ********
>
> VAR_1: this varaible shows VISITDATE when the LOCATION was the first
> "2" [this is somewhat easier]
> Ex:
> For patient 1(ID=1), visit date corresponding to first 2 (in location)
> would be Jan 4
> For patient 2(ID=2), visit date corresponding to first 2 (in location)
> would be Feb 2
>
> *************code begin*******************
> bysort ID  (VISITDATE): gen VAR_1=VISITDATE if LOCATION==2
> bysort ID (VAR_1): gen LOCATION_FIRST2=VAR_1[1]
> ************code end************************
>
> 2)**********I do not know how to generate the following variable
> ******************
>
> VAR_2: this variable shows VISITDATE  when the LOCATION is the second 2
>
> Ex:
> For patient 1(ID=1), visit date corresponding to second 2 (in
> location) would be May 8
> For patient 2(ID=2), visit date corresponding to second 2 (in
> location) would be Feb 6
>
> --
> Thank you ,
> Yours Sincerely,
> Mike.



-- 
Thank you ,
Yours Sincerely,
Mike.
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