I'm very much a novice with R, and not a statistician. But as my group 
has been working with generalized additive models (semi-parametric 
regression), we have followed Wood's advice about using the R anova 
function to do model comparison for different regressions. I would 
imagine at least some of yours might be nested, e.g., adding polynomial 
functions to some? If so, model comparisons like this might be justified.

Will Shadish

On 7/29/2012 10:38 PM, Luis Fernando Garcķa Hernįndez wrote:
> Dear R users,
>
> I have seven regression lines I“d like to compare, in order to find out if
> these are significatively different. The main problem is that these are
> curves,  non normal, non homogeneous data, I“ve tried to linearize them but
> it has not worked. So I“d like to know if you know any command or source in
> R which explains how to perform this kind of comparison.
>
> Thanks in advance for your help!
>
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>
>
>
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> and provide commented, minimal, self-contained, reproducible code.

-- 
William R. Shadish
Distinguished Professor
Founding Faculty
Chair, Psychological Sciences

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William R. Shadish
University of California
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