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RE: st: Non-normal alternative to MANOVA?
From
"Ploutz-Snyder, Robert (JSC-SK)[USRA]" <[email protected]>
To
"[email protected]" <[email protected]>
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: [email protected] [mailto:[email protected]] On Behalf Of Steve Samuels
Sent: Friday, July 02, 2010 10:21 AM
To: [email protected]
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 <[email protected]> wrote:
> See: http://www.stata.com/statalist/archive/2010-05/msg01339.html
>
> Steve
>
> On Fri, Jul 2, 2010 at 9:44 AM, <[email protected]> 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
> [email protected]
> 18 Cantine's Island
> Saugerties NY 12477
> USA
> Voice: 845-246-0774
> Fax: 206-202-4783
>
--
Steven Samuels
[email protected]
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/