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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 00:36:21 +0100 |

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. > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Assistance with manipulating a social network dataset?***From:*Brandon Olszewski <olszewski.brandon@gmail.com>

**References**:**st: Assistance with manipulating a social network dataset?***From:*Brandon Olszewski <olszewski.brandon@gmail.com>

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