RE: st: Tracking & documenting Change

[Rituparna Basu <basur@pamfri.org>]

Thank you Nick! 
Here is the rule:  The dataset is about healthcare service records....so there are duplicates bc one can have more than one doctor's visit in a given year. Also, Insurance is numeric. Do you think the code will be different bc of the duplicates? 
I will let you know if the code worked.

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Thursday, April 05, 2012 11:21 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Tracking & documenting Change

There seems here an indication that -Ins- changes Year to Year, but in that case why the duplicates? Note that the duplicates get in the way of counting transitions.

But I have to take your example literally because you really don't explain the precise rules.

Also, I assume -Ins- is string because you don't specify and it makes the code easier. But if not, then use -decode- first and use the result of that, not the numeric variable with labels.

gen Status = ""
sort ID Year
by ID: replace Status = "Stayed" if Year > Year[_n-1] & Ins == Ins[_n-1] by ID: replace Status = "Changed" if Year > Year[_n-1] & Ins != Ins[_n-1] by ID: replace Status = Status + " " +  Ins  + " " +  Ins[_n-1] if
!missing(Status)
by ID: replace Status = Status[_n-1] if missing(Status)

Code not tested.

Nick

On Thu, Apr 5, 2012 at 7:05 PM, Rituparna Basu <basur@pamfri.org> wrote:

> I would like to track the change of insurance status of a person from year to year. After tracking, I would like to document them as  %'stayed-same' , %'changed from A-B', etc.
> Here is the sample data:
> ID    Year  Insurance Status
> 1        04       A
> 1        04       A
> 1        04       A
> 1        04       A
> 1        05      B             Changed A-B
> 1        05       B           Changed A-B
> 1        05       B           Changed A-B
> 1        06      B            Stayed B
> 1        06       B            Stayed B
> 1        06       B            Stayed B
> 2        04       A
> 2        04       A
> 2        04       A
> 2        05       A         Stayed A
> 2        05       A        Stayed A
> 2       05       A         Stayed A
> 2        05       A        Stayed A
>
>

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