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Re: st: How do I create a calendar year variable by person id before reshaping to person-year dataset?


From   Maarten Buis <[email protected]>
To   [email protected]
Subject   Re: st: How do I create a calendar year variable by person id before reshaping to person-year dataset?
Date   Wed, 5 Feb 2014 18:13:45 +0100

by id : gen year = birthyear + _n -1

also look at -help stsplit- as that command is there for creating such datasets.

Hope this helps,
Maarten


On Wed, Feb 5, 2014 at 6:03 PM, Holly E Reed <[email protected]> wrote:
> Hi,
>
> I am trying to create a person-year dataset for event history analysis. The dataset currently has one observation per person per year of their life, e.g.:
>
> id     age    sex    birthyear
> 1       5        F       1995
> 1       5        F       1995
> 1       5        F       1995
> 1       5        F       1995
> 1       5        F       1995
> 2       3        M      1997
> 2       3        M      1997
> 2       3        M      1997
>
> So person with id==1 is a 5-year old female born in 1995 and person with id==2 is a 3-year old male born in 1997. This is a simplified example to illustrate the dataset, as they are all adults and there are far more observations for each individual.
>
> The problem is that I have age and birthyear variables, but I want to create a calendar year variable before reshaping the data to person-year data.  What is the easiest way to do this?  In other words, I want the dataset to look like this:
>
> id     age    sex    birthyear    year
> 1       5        F       1995        1995
> 1       5        F       1995        1996
> 1       5        F       1995        1997
> 1       5        F       1995        1998
> 1       5        F       1995        1999
> 2       3        M      1997        1997
> 2       3        M      1997        1998
> 2       3        M      1997        1999
>
> Thank you very much for any help you can give me!
> Holly
>
> *
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-- 
---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------
*
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*   http://www.ats.ucla.edu/stat/stata/


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