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From |
David Airey <david.airey@vanderbilt.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Repeated measures |

Date |
Sat, 14 Mar 2009 11:12:20 -0500 |

. I was confused by your data layout. Your data are really just 3 columns wide: WireType WireNo Force where wiretype and wireno are replicated 5 times, So anova force wiretype / wireno|wiretype / is fine, or the equivalent xtmixed... -Dave On Mar 14, 2009, at 3:16 AM, Nikolaos Pandis wrote:

Dear Statalisters,I have the following dataset (except I have it in long format-onemeasurement 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 trialI am testing the forces generated by 4 different wiretypes to see ifthere 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 5times.The outcome is force and it is a continuous variable.This looks like a repeated measures with each trial nested in theWireNo and the WireNo nested inside WireType?I was trying to use the xtgee command but I was not sure how toconstruct 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/

* * 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:*TA Stat <tastat@gmail.com>

**References**:**st: Repeated measures***From:*Nikolaos Pandis <npandis@yahoo.com>

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