st: RE: How to perform a non parametric manova

["Hoffman, George" <ghoffman@mcw.edu>]

Nick Cox replied to a similar question (how to make manova valid on data with non-parametric distributions) a few years back as follows:

"I find some inconsistency in this request. After all, what would a non-parametric MANOVA look like except something like a MANOVA, except that your data have been transformed to ranks? If you are happy to reduce your data to ranks, why cavil at some other transformation, which typically would lose less information?

Further, my visceral instinct is that MANOVA is more robust to non-normality than people fear.

More positively, if this were my problem, I might do

1. MANOVA on original data
2. MANOVA on rank-transformed data

If the conclusions were substantively similar, stop there. Otherwise, consider what specific transformations were advisable.

Nick
n.j.cox@durham.ac.uk
"



-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of amatoallah ouchen
Sent: Wednesday, May 26, 2010 6:38 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: How to perform a non parametric manova

Good day Stata-listers,
Does anyone have an idea about how to perform a non parametric manova?
an equivalent of the kruskal wallis test for anova?

Any help would be highly appreciated.

Ama
I
*
*   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/