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RE: st: Non-normal alternative to MANOVA?


From   "Ploutz-Snyder, Robert (JSC-SK)[USRA]" <robert.ploutz-snyder-1@nasa.gov>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Non-normal alternative to MANOVA?
Date   Fri, 2 Jul 2010 11:19:16 -0500

Are there data transformations that you can use prior to hypoth testing with MANOVA?  The -lnskew- command does a nice job if you have positively skewed data. Other transformations are often suggested (see Tabachnick & Fidell's Using Multivariate Statistics text, for starters) in situations like this.

Rob

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Steve Samuels
Sent: Friday, July 02, 2010 10:21 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Non-normal alternative to MANOVA?

also at:
http://www.stata.com/statalist/archive/2010-05/msg01339.html


On Fri, Jul 2, 2010 at 11:18 AM, Steve Samuels <sjsamuels@gmail.com> wrote:
> See: http://www.stata.com/statalist/archive/2010-05/msg01339.html
>
> Steve
>
> On Fri, Jul 2, 2010 at 9:44 AM,  <marietherese.kelly@flinders.edu.au> wrote:
>> Hi all,
>> I have been asked to analyse a small dataset from a randomized controlled trial,
>> with 24 subjects (12 in each group, control and intervention). There are 3 sets
>> of continuous outcome measures (b1, b2, b3) taken at baseline, 7 weeks and 3
>> months, and 2 variables  which need to be controlled for  - level of impairment
>> impair (binary) and number of interventions numint (continuous integer).
>>
>> If the data were normal I would have done something like this:
>>
>> manova b1 b2 b3=group impair numint, continuous(numint)
>>
>> and then do various manova tests.
>>
>> Unfortunately the outcome data b1-3 are highly skewed, so I can't use manova.
>> What would be a good alternative?
>>
>> Thanks.
>>
>> *
>> *   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/
>>
>
>
>
> --
> Steven Samuels
> sjsamuels@gmail.com
> 18 Cantine's Island
> Saugerties NY 12477
> USA
> Voice: 845-246-0774
> Fax:    206-202-4783
>



-- 
Steven Samuels
sjsamuels@gmail.com
18 Cantine's Island
Saugerties NY 12477
USA
Voice: 845-246-0774
Fax:    206-202-4783

*
*   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/


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