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From | "Joseph Coveney" <jcoveney@bigplanet.com> |
To | <statalist@hsphsun2.harvard.edu> |
Subject | st: Re: Skilmack across group |
Date | Thu, 9 Aug 2012 20:31:58 +0900 |
Jonathan Lam wrote: I want to compare agreement between k measurements cross groups. I am aware of the non-parametric Skillings-Mack test, which can handle repeated measures with unblanaced observations. However, I don't know how to execute the corss-group comparision (invention vs. control) in this test which is similar to what I did using ANOVA: For skilmack, this is what I have: Skilmack hba1c, id(id) repeated(survey) For repeated measure ANOVA, this is what I have: Anova hba1c group / id|group survey group#survey, repeated(survey) Can you show me how to compare cross group with the skilmack test? -------------------------------------------------------------------------------- Neither the Friedman test nor the Skillings-Mack test is intended to be used with individuals nested within groups, and so you're not going to be able to use them in a split-plot design like for your repeated-measures ANOVA. I'm not sure that I understand what it is that you want to do. Do you want to compare the magnitude of inter-rater agreement in Group A to the magnitude of inter-rater agreement in Group B? That is, are you seeking to use Kendall's coefficient of concordance from -friedman- (or some surrogate of it from -skilmack-) as a nonparametric index of agreement? If so, then you might be able to use -skilmack- on the groups separately in conjunction with a resampling method. Joseph Coveney * * 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/