[R] more questions on gam/gamm(mgcv)...

[Gavin Simpson]

> Hi R-users,
>
> I'm using R 2.11.1, mgcv 1.6-2 to fit a generalized additive mixed model.
> I'm new to this package...and just got more and more problems...
>
> 1. Can I include correlation and/or random effect into gam( ) also? or
> only
> gamm( ) could be used?

Only in gamm()

> 2. I want to estimate the smoothing function s(x) under each level of
> treatment. i.e. different s(x) in each level of treatment. shall I use
> s(x,
> by=treatment)? When I checked the basis expansion I found they are all the
> same...but shouldn't be the same right?

Do you mean the estimated smooths are the same?

> 3. fit=gam(.......)
>     basis=fit$smooth
>     par=basis[[1]]$xp
>
>    Here, is "par" the vector of knots...? Where can I find the fitted coef
> of smoothing function..??

coef(fit)

>
> Thank you all and any hint/help will be appreciated...
>
>
> --
> Best,
> Xia
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
>