You need to ask in such circumstances what is being tested. ANOVA is, implicitly, a comparison of location parameters but is often misreported as showing "difference" or "no difference" without specifying in what.
Approaches would include non-parametric anova (comparing medians rather than means), variance-stabilizing transformations, and GLMs which do not assume the random terms are "normal with equal variance".
Allan
------------------------------
Date: Wed, 03 Oct 2007 15:49:18 +0200. Rachele Capocchi <[email protected]> asked:
Can anybody help me to do Anova test if there is difference on the 3 groups' means with Stata,
considering that the variances of 3 groups are not homogeneity ?
***********************************************************************************
This email and any attachments are intended for the named recipient only. Its unauthorised use, distribution, disclosure, storage or copying is not permitted. If you have received it in error, please destroy all copies and notify the sender. In messages of a non-business nature, the views and opinions expressed are the author's own and do not necessarily reflect those of the organisation from which it is sent. All emails may be subject to monitoring.
***********************************************************************************
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
