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From | "Carlo Lazzaro" <carlo.lazzaro@tiscalinet.it> |
To | <statalist@hsphsun2.harvard.edu> |
Subject | R: st: R: Anova repeated measures |
Date | Thu, 22 Apr 2010 18:42:40 +0200 |
Dear Peter, You are right about time role: I did not take it into account in my previous reply. Unfortunately, the code you suggest gives me the following error message in Stata 9.2/SE): anova vas gruppe /projektnum|gruppe t t#gruppe , repeated(t) repeated term r(141); Admittedly, I did not investigate its cause. Kind Regards, Carlo -----Messaggio originale----- Da: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Peter Kraglund Jacobsen Inviato: giovedì 22 aprile 2010 16.42 A: statalist@hsphsun2.harvard.edu Oggetto: Re: st: R: Anova repeated measures How do I take take the time factor into account, if not using ANOVA repeated measures? How about this: anova vas gruppe /projektnum|gruppe t t#gruppe , repeated(t) 2010/4/22 Carlo Lazzaro <carlo.lazzaro@tiscalinet.it>: > Instead of a repeated ANOVA, and warning about the missing values (which may > raise substantial issues in his analysis), Peter may want to perform an OLS > on vas as dependent variable with clustered standard error on projektnum, > being this one the principal sample unit. > > ----------------- begin code ------------------ > g gruppe_bis=0 if gruppe=="Parenteral morphine" > replace gruppe_bis=1 if gruppe=="XXX with NaCl" > replace gruppe_bis=2 if gruppe=="XXX with Naropine" > reg vas gruppe_bis, cluster(projektnum) > ----------------- end code ------------------ > > HTH and Kind Regards, > Carlo > -----Messaggio originale----- > Da: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Peter Kraglund > Jacobsen > Inviato: mercoledì 21 aprile 2010 22.24 > A: statalist@hsphsun2.harvard.edu > Oggetto: st: Anova repeated measures > > projektnum t gruppe vas > 93 1 Parenteral morphine 8 > 93 2 Parenteral morphine . > 93 3 Parenteral morphine 9 > 93 4 Parenteral morphine 9 > 93 5 Parenteral morphine 8 > 95 1 XXX with NaCl 5 > 95 2 XXX with NaCl . > 95 3 XXX with NaCl 3 > 95 4 XXX with NaCl 2 > 95 5 XXX with NaCl . > 101 1 XXX with Naropine 3 > 101 2 XXX with Naropine . > 101 3 XXX with Naropine 5 > 101 4 XXX with Naropine 5 > 101 5 XXX with Naropine . > > In this example, three persons (projektnum) in three groups (gruppe) > are asked about pain score (vas) at five different times (t). > How do I show if there is a difference in VAS between the three groups? > * > * 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/