Gene,
David has given you the preferred code. I just want to
point out that the $-accessor is often not the best
thing to use. Both dat[["y"]] and dat[, "y"] will work
just fine.
Peter Ehlers
On 2011-05-05 12:06, David Winsemius wrote:
On May 5, 2011, at 1:08 PM, Gene Leynes wrote:
This is not mission critical, but it's bothering me. I'm getting
inconsistent results when I use the $ accessor in the gam formula
*In window #1:*
library(mgcv)
dat=data.frame(x=1:100,y=sin(1:100/50)+rnorm(100,0,.05))
str(dat)
gam(dat$y~s(dat$x))
Error in eval(expr, envir, enclos) : object 'x' not found
I get the same error, but using the standard R approach to passing
data and formulae to regression functions I have not difficulty:
> gam(y~s(x), data=dat)
Family: gaussian
Link function: identity
Formula:
y ~ s(x)
Estimated degrees of freedom:
4.1552 total = 5.155229
GCV score: 0.002242771
*In window #2:*
gm = gam(dat$cf~s(dat$s))
gm
Family: gaussian
Link function: identity
Formula:
dat$cf ~ s(dat$s)
Estimated degrees of freedom:
8.7757 total = 9.77568980091
GCV score: 302.551417213
Has anyone else seen the same thing?
In both cases I'm using Windows 7 and R 2.13.0
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David Winsemius, MD
West Hartford, CT
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
