[R] R² for non-linear model

[Anna Gretschel]

Am 16.03.2011 18:15, schrieb David Winsemius:
>
> On Mar 16, 2011, at 12:53 PM, Anna Gretschel 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!
>
> You should do more searching. I can remember at least two threads in 
> the last few years that discussed this issue.
>
yes there are threads concidering this topic but they are all about the 
theory not about how to get the value of r^2 for a non-linear model in R.