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Re: st: Assistance with manipulating a social network dataset?


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Assistance with manipulating a social network dataset?
Date   Wed, 12 Oct 2011 23:43:15 +0100

Pleased you solved your problem. As mentioned in the thread starting with

http://www.stata.com/statalist/archive/2011-04/msg00767.html

the recommendations on that website are not the same as those in my
note. That doesn't matter if either works.

On Wed, Oct 12, 2011 at 7:59 PM, Brandon Olszewski
<olszewski.brandon@gmail.com> wrote:
> Yes! That's what I needed! The
> http://www.ats.ucla.edu/stat/stata/faq/dyad_ids.htm page sorted it all
> out for me - very well written with a clear example.
>
> Thank you, Nick.
>
> Brandon
>
> On Tue, Oct 11, 2011 at 4:36 PM, Nick Cox <njcoxstata@gmail.com> wrote:
>> Your last question is addressed in
>>
>> SJ-8-4  dm0043  . Tip 71: The problem of split identity, or how to group dyads
>>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>>        Q4/08   SJ 8(4):588--591                                 (no commands)
>>        tip on how to handle dyadic identifiers
>>
>> Nick
>>
>> On Tue, Oct 11, 2011 at 11:05 PM, Brandon Olszewski
>> <olszewski.brandon@gmail.com> wrote:
>>
>>> I have a social network dataset, and I can’t figure out how to perform
>>> the proper manipulations. People in rows were asked if they know
>>> people listed in columns. In cells, “0” indicates two people don’t
>>> know each other, and “1” indicates otherwise. So what I have looks
>>> like this:
>>>             Adam Beth  Charlie
>>> Adam    1       1       0
>>> Beth            0       1       0
>>> Charlie 0       1       1
>>>
>>> Note that while Adam claims to know Beth, Beth doesn’t claim the same,
>>> and while Beth says she doesn’t know Charlie, he says otherwise. For
>>> my purposes, I want to assume that if anyone says they know someone
>>> else, to treat it as a “1” both ways.
>>>
>>> The software I want to use (Sonoma) wants the data in one of two
>>> formats. Here’s the wide option, which offers only one half the
>>> matrix, with “1” coded in the diagonal and “.” coded in the bottom
>>> half, with max values for combinations in cells:
>>>            Adam        Beth    Charlie
>>> Adam    1       1       0
>>> Beth           .        1       1
>>> Charlie .       .       1
>>>
>>> Question 1: How would I do this in Stata? I looked at -help mata-, but
>>> I don’t even know if that’s the right direction. Is it? If not, how
>>> might I do it? This option seems more difficult for me (given my
>>> familiarity with Stata’s functionality) than the “long option” below.
>>>
>>> Here’s the long option, which seems more feasible for me, given my
>>> level of skill. Note that each combination is listed just once, again
>>> with maximum values:
>>> Adam    Adam    1
>>> Adam    Beth            1
>>> Adam    Charlie 0
>>> Beth            Beth            1
>>> Beth            Charlie 1
>>> Charlie Charlie 1
>>>
>>> Question 2: I can get the data to long format fine no problem. But end
>>> up with duplicates of combinations, as Adam is asked about Ben, and
>>> Ben is asked about Adam (i.e. a total of 9 observations, rather than
>>> the six above). How could I drop duplicate combinations, saving only
>>> the max value for each? While I am pretty familiar with the
>>> -duplicates- set of commands, I’m running into the problem that I
>>> don’t know how to use the command since combinations go both ways,
>>> where Adam-Beth is a duplicate of Beth-Adam. I’ve also thought about
>>> it substituting numbers for people (i.e. 1-2 & 2-1), but that doesn’t
>>> change my problem that I can’t figure out how to tell Stata to treat
>>> those as duplicates.
>>>
>>
>> *
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>>
>
> *
> *   For searches and help try:
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>

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