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Re: st: repeated measures ANOVA to MANOVA
From
Ricardo Ovaldia <[email protected]>
To
[email protected]
Subject
Re: st: repeated measures ANOVA to MANOVA
Date
Wed, 1 Feb 2012 07:18:59 -0800 (PST)
Never mind. Thank you. I found the answer on page 359 of the manual.
I am now concerned because the pvalue from MANOVA is so much smaller than the Huynh-Feldt corrected p-value
Thank you again,
Ricardo
Ricardo Ovaldia, MS
Statistician
Oklahoma City, OK
--- On Wed, 2/1/12, Ricardo Ovaldia <[email protected]> wrote:
> From: Ricardo Ovaldia <[email protected]>
> Subject: st: repeated measures ANOVA to MANOVA
> To: "Statalist" <[email protected]>
> Date: Wednesday, February 1, 2012, 8:50 AM
> I have data on 23 patients that were
> evaluated using three competing medical methods. I used
> repeated measures ANOVA and reported the Huynh-Feldt
> corrected p-value. A reviewer suggested that it would be
> better to do a MANOVA. However, when I try this, Stata
> reports the error:
>
> . manova m1 m2 m3=id
> matrix not positive definite
> insufficient residual degrees of freedom for this
> multivariate model
>
> Any help will be appreciated.
> Ricardo
>
> Here is the data:
> . cl id m1 m2 m3
>
> id
> m1 m2
> m3
> 1.
> 106 22.2 30.6 13.9
> 2.
> 111 26.4 32.2 14.6
> 3.
> 119 23.6 28.9 26.7
> 4.
> 122 27.4 38.0 28.9
> 5.
> 130 17.5 24.5 41.4
> 6.
> 131 18.4 21.5 20.2
> 7.
> 133 28.1 28.1 22.3
> 8.
> 135 33.5 38.5 29.9
> 9.
> 140 18.9 25.7 15.1
> 10.
> 144 21.2 28.3 37.0
> 11.
> 149 18.8 25.6 15.5
> 12.
> 152 22.4 31.5 28.5
> 13.
> 153 21.5 28.6 22.5
> 14.
> 158 27.9 37.6 37.2
> 15.
> 167 30.1 42.3 24.0
> 16.
> 168 28.5 36.9 32.4
> 17.
> 171 23.5 36.7 27.8
> 18.
> 176 24.6 24.5 25.8
> 19.
> 180 29.4 30.3 15.2
> 20.
> 188 23.2 24.6
> 9.1
> 21.
> 191 25.7 31.7 31.2
> 22.
> 192 20.1 19.7
> 8.2
> 23.
> 194 23.4 27.7
> 6.0
>
>
> Ricardo Ovaldia, MS
> Statistician
> Oklahoma City, OK
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>
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