[R] R² for non-linear model

[Joshua Wiley]

Dear Anna,

What is your goal in obtaining a value for R^2 ?  I believe it is not
provided for a non-linear model, because it does not make much sense.
It certainly will not have the same interpretation as in a linear
model, and all the ways it *could* be "defined" come with their own
sets of problems.  A more precise definition of what you want (say you
have a particular formula but do not know how to get the necessary
information out of the model) may get a better answer.

Best regards,

Josh

On Wed, Mar 16, 2011 at 9:53 AM, Anna Gretschel <ana-lee at web.de> wrote:
> Dear List,
>
> how can I obtain the value of r suqared for a non-linear model? For
> linear models it can be found in the summary() of the model but for
> non-linear models I just don't know. Please help!
>
> Anna
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/