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Robust ANOVA or alternative test?
3 messages · jinyan fan, Liviu Andronic, Kingsford Jones
Hello
On 11/2/09, jinyan fan <fanjinyan at yahoo.com> wrote:
to address this issue, either by some sort of Robust ANOVA procedure, or by some alternative tests? Thanks a lot.
I cannot address this specific question, but you may want to address robustness-related queries to r-sig-robust, and perhaps check the Robust [1] Task View. Best Liviu [1] http://cran.r-project.org/web/views/Robust.html
See the nlme library and accompanying book by Pinheiro and Bates. The lme function is appropriate for linear mixed models with normal errors, and the 'weights' argument provides flexible methods for modeling error heterogeneity. hth, Kingsford
On Mon, Nov 2, 2009 at 12:10 PM, jinyan fan <fanjinyan at yahoo.com> wrote:
Dear Colleagues, I am running a three-way mixed-design ANOVA, with one manipulated IV, a group membership IV, and pre-/post- within subject factor. I am interested in the three-way interaction effect. The regular ANVOA is problematic, because (a) the sample sizes are very unbalanced, due to the group IV, (b) the homogeneity of?variance?is violated, and (c) the homogeneity of covariance is also violated. I wonder if R has a procedure to address this issue, either by some sort of Robust ANOVA procedure, or by some alternative tests? Thanks a lot. Jinyan Fan Assistant Professor Department of Psychology Hofstra University Hempstead, NY 11550 Work: 516-463-6349 ? ? ? ?[[alternative HTML version deleted]]
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