Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: repeated measures ANOVA to MANOVA


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
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 <ovaldia@yahoo.com> wrote:

> From: Ricardo Ovaldia <ovaldia@yahoo.com>
> Subject: st: repeated measures ANOVA to MANOVA
> To: "Statalist" <statalist@hsphsun2.harvard.edu>
> 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
> *
> *   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/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index