Am 16.03.2011 18:19, schrieb 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-...@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
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Dear Josh,
I actually want to find out the goodness of fit. I have to make choises
between a linear and an exponential model and I thought comparing their
r squares would give me an idea of which one better explains the
correlation of the data. So if r squared does not work for non-linear
regression - do you have an idea how to calculate some goodness of fit?
Thank you a lot for replying!
Cheers, Anna
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