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Re: Re: st: Creating variables from a matched pair


From   "Kopsic, Jessica" <kopsicj@ccbh.com>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   Re: Re: st: Creating variables from a matched pair
Date   Mon, 8 Oct 2012 19:07:08 +0000

Hi David, 

I want the second thing you specified - "two observations for each pair -- the second one with the roles reversed."

The data looks like this: 

Partner A: DOB Partner A, Sex Partner A
Partner B: DOB Partner B, Sex Partner B

And so on for all the pairs. Each person's data is a row. That row contains only information for that person. Unique IDs down the left-hand side, variables across the top. 

I'd like it to look like this: 
Partner A: DOB Partner A, DOB Partner B, Sex Partner A, Sex Partner B
Partner B: DOB Partner A, DOB Partner B, Sex Partner A, Sex Partner B

The ordering does not matter, I just wrote it that way to emphasis that each row would now have data for that person and the exact same data for their partner. Their partner, in turn, would then also have a row that contains their data and their partner's data. 

And then so on for each pair. 

Everyone has a unique ID with the structure outlined in my previous message. 

Let me know if it's still unclear. Thank you. 

Jessica 

You need to be a bit more specific about what the data look like and what the desired result looks like. But from a brief look, this may be a case for -reshape wide-. -reshape wide- will yield one observation for each pair. If you want two observations for each pair -- the second one with the roles reversed -- then you need to do some additional work, but it is not hard.

Tell us more, and we'll be better able to help.
--David

At 02:15 PM 10/8/2012, Jessica Kopsic wrote:

    I have a dataset with matched pairs, and I'd like to create a dataset where each person's partner's observations are variables. So like this:

    Partner A: DOB Partner A, DOB Partner B, Sex Partner A, Sex Partner B

    Currently everything is in this format:
    Partner A: DOB Partner A, Sex Partner A
    Partner B: DOB Partner B, Sex Partner B

    The ID numbers are structured like this:
    1A01
    1B01
    1A02
    1B02
    2A01
    2B01
    2A02
    2B02

    The numbers at the beginning are rounds. Then partner A or B. Then numbers that match the pair together. The number sets got reused for each round so numbers may or may not be unique throughout the whole dataset, but they are restricted to one set of partners for each round. (So IDs are unique throughout the whole dataset.)


    This dataset will be used in other programs, so I'd like to create the dataset up front rather than match during analyses. I'm flummoxed by this one and came up empty searching archives. Thank you.

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