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Re: st: Tracking & documenting Change


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Tracking & documenting Change
Date   Thu, 5 Apr 2012 19:51:30 +0100

You must, or least should, have a variable that tells you the date
more exactly.

Why say

1        05      B             Changed A-B
1        05       B           Changed A-B
1        05       B           Changed A-B

and not

1        05      B            Changed A-B
1        05       B           Stayed B
1        05       B           Stayed B

Naturally, the results for transitions will depend on what you define
as a possible transition. How could it be otherwise?

On Thu, Apr 5, 2012 at 7:30 PM, Rituparna Basu <basur@pamfri.org> wrote:
> 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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