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Re: st: R: a person-period multi-episode event history file


From   "K.O. Ivanova" <K.O.Ivanova@rug.nl>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: R: a person-period multi-episode event history file
Date   Wed, 07 Oct 2009 14:48:50 +0200

Thank you, Carlo. I will try your suggestion out.

Best,

Katya

Carlo Lazzaro wrote:
> Katya wrote:
>
>
> <Basically, I have 1513respondents and each one has been followed for 60
> months (which are not identical for all respondents – for example, one is
> followed from Nov 01 to Nov 06 and another one from Jun 02 to Jun 07, and so
> on).>
>
> This would seem a minor matter of concern, since I suppose that is the
> observation span of time that matters. Hence, you can set t0 when the
> subject comes to your attention unless enrolling subjects at different times
> may influence, for whatever reason , the result of your analysis.
>
> <What I need is to create a 0/1 variable for each one of those months
> denoting whether or not a certain event has taken place for that
> person. It is easy when it is an event which occurs only once (e.g.,
> divorce of biological parents). It gets more complicated however, when
> I have events which not only can occur multiple times but also have
> different durations.>
>
> Are you sure you cannot switch to Stata built-in Survival Analysis
> procedures?
>
> Otherwise, you can create an ad hoc variable and define value labels for
> each event you are interested in (please, type - help label - in Stata)
>
> label define event 1 "unemployment"
> label define event 2 "on the job training"
> label define event 3 "on holidays"
>
> and so on and so forth
>
> Then, you can:
>
> count if event==1 & id==1 &  month=="Jan_01"
>
> <What I need to do now is create a “dating status”
> variable per month which has the value of 1 if the adolescent was
> dating in that month and a value of 0 if they weren’t.>
>
> This is a very temptative answer:
> g dating_index=1 if Start rel_n !="." $	End rel_n=="."
>
> Sorry I cannot be more helpful.
> Kind Regards,
> Carlo
> -----Messaggio originale-----
> Da: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di K.O.Ivanova
> Inviato: lunedì 5 ottobre 2009 17.02
> A: statalist@hsphsun2.harvard.edu
> Oggetto: st: a person-period multi-episode event history file
>
> Hello, all.
>
> I am struggling with the following problem: I am trying to create a
> person-period multi-episode event history file. Basically, I have 1513
> respondents and each one has been followed for 60 months (which are
> not identical for all respondents – for example, one is followed from
> Nov 01 to Nov 06 and another one from Jun 02 to Jun 07, and so on).
>
> What I need is to create a 0/1 variable for each one of those months
> denoting whether or not a certain event has taken place for that
> person. It is easy when it is an event which occurs only once (e.g.,
> divorce of biological parents). It gets more complicated however, when
> I have events which not only can occur multiple times but also have
> different durations.
>
> In my case, that problem comes from the “dating status of the
> adolescent” variable. What I have right now are two variables per
> dating episode, one denoting start of dating episode and the other
> one, end of dating episode. I have also created 60 variables per
> respondent denoting the end of each “individual-specific” month of
> observation. What I need to do now is create a “dating status”
> variable per month which has the value of 1 if the adolescent was
> dating in that month and a value of 0 if they weren’t.
>
> Basically, I need to get from something like this:
>
> Id 	Start rel 1	End rel 1	Start rel 2	End rel 2
> 1	Apr 01          Jul 01          Sept 01         Dec 01
> 2	May 02	        still going on		
>
>
> To something like this:
>
>
> Id    Calendar mo    # of mo of obs     Dating status    Dating index
>           of obs
>
> 1	Jan 01	             1	               0          0
> 1	Feb 01	             2                 0            0
> 1	Mar 01	             3	               0	        0
> 1	Apr 01	             4	               1	        1
> 1	May 01	             5	               1	        1
> 1	Jun 01	             6	               1	        1
> 1	Jul 01	             7	               1          1
> 1	Aug 01	             8	               0	        0
> 1	Sep 01	             9	               1	        2
> 1	Oct 01	             10	               1	        2
> 1	Nov 01	             11	               1	        2
> 1	Dec 01	             12	               1	        2
> 2	Mar 02	             1	               0	        0
> 2	Apr 02	             2	               0	        0
> 2	May 02	             3	               1	        1
> 2	Jun 02	             4	               1	        1
> 2	Jul 02                   5	                1	         1
> 2	Aug 02	             6	               1	        1
> 2	Sep 02	             7	               1	        1
> 2	Oct 02	             8	               1	        1
> 2	Nov 02	             9	               1	        1
> 2	Dec 02	             10	               1	        1
> 2	Jan 02	             11	               1	        1
> 2	Feb 02	             12	               1	        1
>
>
> To answer a possible question – yes, I do need to maximally expand the
> data. I cannot stop the clock at first change in dating status. I want
> to have all the information from start of observation to interview
> date.
>
>
> Can anyone help me out with the syntax? Thank you!
>
>
> Katya
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