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Re: st: reshaping database with dates ordered in wide format to long format

From   Nick Cox <>
Subject   Re: st: reshaping database with dates ordered in wide format to long format
Date   Sun, 10 Feb 2013 11:34:03 +0000

More strategic advice. You would need some -rename-ing first, so that
postcodes, etc., dates, etc. end up aligned.


On Sun, Feb 10, 2013 at 10:48 AM, Nick Cox <> wrote:
> I have strategic rather than tactical advice as I failed to absorb
> everything here. -reshape long- first, however crudely, then work on
> the dataset in that form.
> It sounds as if you are seeking a command that does everything in one
> go, but that sounds unlikely.
> If you don't get better answers:
> 1. An example of the data usually helps.
> 2. Show us the commands you have tried so far.
> Nick
> On Sun, Feb 10, 2013 at 10:33 AM, hind lazrak <> wrote:
>> I have a cohort of families that are followed over time.
>> They are asked at one time point (3months after the birth of their
>> child) to list the addresses and dates of move in and move out where
>> they have lived since they consented to participate in the study.
>> For some families it is simple: they have never moved- but for others,
>> there is quite some movement.
>> The way the questionnaire was entered is shaped in wide format
>> For example, consider this simplified version of the data I have
>> For each id we have the following variables
>> reside3mq1 reside3mq2 reside3mq2a reside3mq2b
>> reside3mq3 reside3mq3a reside3mq3b
>> reside3mq4 reside3mq4a reside3mq4b
>> Data dictionary -
>> reside3mq1 is binary and indicates if the family has moved since consent
>> reside3mq`i' is the date of move-in  in address`i'
>> reside3mq`i'a is the postal code at address `i'  /*postal code is alphanumeric*/
>> reside3m`i'b is the date of move-out at address`i'
>> So, if `i' can go from 2 to 5 (not all family move 3 times so it varies by id)
>> How can I generate a data set where each id has `i' rows with move-in
>> and move-out dates and corresponding postal code?
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