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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 11:33:05 -0500 |

. I think measurements nested in wire is the residual in the model anova force wiretype / wireno|wiretype / -Dave On Mar 14, 2009, at 11:26 AM, TA Stat wrote:

I think it is measurements nested in specimen nested in wiretype. Your main objective is to identify whether variation among wiretype is significant or not. Right? Pete On Sat, Mar 14, 2009 at 11:12 PM, David Airey <david.airey@vanderbilt.edu> wrote:. 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-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 trialI am testing the forces generated by 4 different wiretypes to seeif thereare 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 measurement5 times.The outcome is force and it is a continuous variable.This looks like a repeated measures with each trial nested in theWireNoand the WireNo nested inside WireType?I was trying to use the xtgee command but I was not sure how toconstructit: 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/* * 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/

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

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

**Re: st: Repeated measures***From:*TA Stat <tastat@gmail.com>

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