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From |
Nikolaos Pandis <npandis@yahoo.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Repeated measures |

Date |
Sat, 14 Mar 2009 01:16:03 -0700 (PDT) |

Dear Statalisters, I have the following dataset (except I have it in long format-one measurement per row) : WireType WireNo Trial Force A A1 1,2,3,4,5 5 measurements-1 per trial A A2 1,2,3,4,5 5 measurements-1 per trial A A3 1,2,3,4,5 5 measurements-1 per trial A A4 1,2,3,4,5 5 measurements-1 per trial A A5 1,2,3,4,5 5 measurements-1 per trial B B1 1,2,3,4,5 5 measurements-1 per trial B B2 1,2,3,4,5 5 measurements-1 per trial B B3 1,2,3,4,5 5 measurements-1 per trial B B4 1,2,3,4,5 5 measurements-1 per trial B B5 1,2,3,4,5 5 measurements-1 per trial C C1 1,2,3,4,5 5 measurements-1 per trial C C2 1,2,3,4,5 5 measurements-1 per trial C C3 1,2,3,4,5 5 measurements-1 per trial C C4 1,2,3,4,5 5 measurements-1 per trial C C5 1,2,3,4,5 5 measurements-1 per trial D D1 1,2,3,4,5 5 measurements-1 per trial D D2 1,2,3,4,5 5 measurements-1 per trial D D3 1,2,3,4,5 5 measurements-1 per trial D D4 1,2,3,4,5 5 measurements-1 per trial D D5 1,2,3,4,5 5 measurements-1 per trial I am testing the forces generated by 4 different wiretypes to see if there are significant differences. For each wiretype (categorical A B C D) I am using 5 specimens (A1-5,..D1-5) and for each specimen I am repeating the measurement 5 times. The outcome is force and it is a continuous variable. This looks like a repeated measures with each trial nested in the WireNo and the WireNo nested inside WireType? I was trying to use the xtgee command but I was not sure how to construct it: xi:xtreg force i.xxxxx i.yyyyyy, i(zzzzz) ? Any help would be appreciated. Thank you very much, Nikolaos * * 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: Repeated measures***From:*David Airey <david.airey@vanderbilt.edu>

**Re: st: Repeated measures***From:*David Airey <david.airey@vanderbilt.edu>

**Re: st: Repeated measures***From:*David Airey <david.airey@vanderbilt.edu>

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