[R] Nonnormal Residuals and GAMs

David Winsemius dwinsemius at comcast.net
Thu Nov 7 04:11:28 CET 2013

On Nov 6, 2013, at 5:44 PM, Collin Lynch wrote:

>> The default functional link for mgcv::gam is "log", so I doubt that
> your theoretical understanding applies to GAM's in general. When Simon
> Wood wrote his book on GAMs his first chapter was on linear models, his
> second chapter was on generalized lienar models at which point he had
> written over 100 pages, and only then did he "introduce" GAMs. I think
> you need to follow the same progression, and this forum is not the
> correct one for statistics education. Perhaps pose your follow-up
> questions to CrossValidated.com
> David, thank you for your advice, has the default changed for mgcv::gam?
> Based upon the help pages for the version I have (1.7-27) I had thought
> that the default family was gaussian() with link "identity".
> In any event I will look again at Simon Woods' book and consider
> CrossValidated in the future.

I may have gotten this wrong by only referring to my memory. I'm not able to tell by looking at either         ?mgcv::gam or ?gam::gam pages where I picked up this notion.

David Winsemius
Alameda, CA, USA

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