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From |
robert hartman <rohartman@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Collecting Statistics of Averages of Variables |

Date |
Fri, 28 Sep 2012 13:55:39 -0400 |

Hi Listers, I'm struggling with a couple of programming challenges. I will start with this one. Any input on efficient ways to code this would be most appreciated. I want to take mean (or could be other "egen"/"collapse" type summary statistic) form all possible combinations (of subsets of various sizes) from a set of variables. For example, if I have v1, v2, v3, and v4, I would want the mean of each: v1v2, v1v3, v1v4, v1v2v3, v1v2v4, v1v3v4...v3v2...v3v2v4, etc. By v1v2v3, I mean gen v1v2v3=(v1+v2+v3)/3; (assuming the summary statistic of interest is the mean) by v1v2v3v4, I mean v1v2v3v4=,I mean gen v1v2v3v4=(v1+v2+v3+v4)/4. etc. I don't need to actually create permanent variables, simply 1. create a temporary "combination variable" (e.g., v1v2v4 = rowmean(v1 v2 v4)) for each possible combination, 2. collect summary statistics of interest from "combination variables." 3. spit out a file that conveys this information intelligibly For example, I may want to write out a file that gives (a) the name of the combination (e.g., v1v2v4--the column representing the rowmean of those three variables) and (b) the mean and standard deviation of that v1v2v4 variable. In my particular case, I have about a 70 variable space from which to create all these subset combinations. Any helpful starting points or coding ideas would be helpful. Thanks, Rob Hartman * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Collecting Statistics of Averages of Variables***From:*Nick Cox <njcoxstata@gmail.com>

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