[Rd] nonparametric analysis of covariance

From: Daniela Recchia <daniela_recchia_at_yahoo.com.br>
Date: Wed, 24 Nov 2010 02:02:23 -0800 (PST)

Hi there,

I want to do a nonparametric covariance analysis and I have tried to use the package "sm" function "sm.ancova" but it didn't work for me because I have more then one covariates (I have 18 covariates and 3 factors).

I want to analyse for one factor (who has 13 levels) where the differences for my response are, using the explanatory (covariates). (The other two factors are: Temperature and force needed).

I mean, I want to create groups for the levels of the factor, where within each group no significant difference exist.

My residuals haven't normal distribution and aren't homoscedastic. I have tried already the boxcox transformation and glm procedures, but whitout success. So I am looking for these methos for nonparametrics analysis of covariance.

Thanks for any help.  

Daniela Rodrigues Recchia

Master Student of Statistics - Technische Universitšt Dortmund.
"Like dreams, statistics are a form of wish fulfillment."
Jean Baudrillard.

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