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From |
Brandon Olszewski <olszewski.brandon@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: How to combine variables in network data - can I loop over stubs? |

Date |
Wed, 20 Apr 2011 16:23:17 -0700 |

I have a -wide- social network data set that needs some cleaning. It contains about 40 different projects, here named AAA, BBB, CCC, etc. Each project is connected to every other project at some level, 0 = “no familiarity”, 1 = “familiar”, and 2 = “works with a lot”. Rows represent projects, and columns represent the level of familiarity a project has with others. Here is what the data look like, then: project AAA_0 AAA_1 AAA_2 BBB_0 BBB_1 BBB_2 AAA 1 BBB 0 Etc. In the above example, project AAA knows B at a level 1 (familiar), and project BBB reports not knowing project AAA (at a level 0). I want to create variables (total_AAA, total_BBB, etc.) that combine columns with the same stub (“AAA”, “BBB”, etc.) so that one new column represents the three old columns. The new column would contain a value (0, 1, or 2) that was previously represented in wide format across three columns. Searching the statalist, the following post is the closest I found: http://www.stata.com/statalist/archive/2007-03/msg00234.html. I’m thinking of using a -foreach- command to do it, but I think I would need to loop the command over a stub, rather than a varname. I also know how to use -renpfix- to change stub names. In my ideal world, a solution would look like: >>> foreach stub of stubname AAA BBB{ gen total`stub’=0 replace total`stub’=2 if `stub’_1==1 replace total`stub’=3 if `stub’_2==2 } keep project total* >>> I've racked my brain with -reshape- and some other commands I know, but the logic eludes me and I am still unsuccessful. Can anyone help me? Thanks, Brandon Olszewski Research Associate International Society for Technology in Education * * 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: How to combine variables in network data - can I loop over stubs?***From:*Nick Cox <njcoxstata@gmail.com>

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