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R: st: R: Anova repeated measures
From
"Carlo Lazzaro" <[email protected]>
To
<[email protected]>
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: [email protected]
[mailto:[email protected]] Per conto di Peter Kraglund
Jacobsen
Inviato: giovedì 22 aprile 2010 16.42
A: [email protected]
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 <[email protected]>:
> 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: [email protected]
> [mailto:[email protected]] Per conto di Peter Kraglund
> Jacobsen
> Inviato: mercoledì 21 aprile 2010 22.24
> A: [email protected]
> 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?
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