Hi List,
While using 'nlme' function, I have encountered the similar problem Dr. Stevens
and Dr. Graves observed (please see the posts:
https://stat.ethz.ch/pipermail/r-help/2006-May/105832.html ). I have tried Dr.
Stevens's original example, the problem is still there,
> mod.lis <- nlsList(circumference ~ SSlogis(age, Asymp, xmid, scal),
+ data=Orange )
>
> mod <- nlme(circumference ~ SSlogis(age, Asymp, xmid, scal),
+ data=Orange,
+ fixed = Asymp + xmid + scal ~ 1,
+ start = fixef(mod.lis) )
>
> mod <- nlme(circumference ~ SSlogis(age, Asymp, xmid, scal),
+ data=Orange,
+ fixed = list(Asymp ~ 1, xmid ~ 1, scal ~ 1),
+ start = fixef(mod.lis) )
Error in parse(file, n, text, prompt, srcfile, encoding) :
syntax error, unexpected END_OF_INPUT in "~ "
> sessionInfo()
R version 2.5.1 (2007-06-27)
i386-pc-mingw32
locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
attached base packages:
[1] "stats" "graphics" "grDevices" "utils" "datasets" "methods"
"base"
other attached packages:
lattice nlme
"0.15-11" "3.1-86"
Just wondering if you guys have any answers for this since I didn't see any for
the original posts.
Thanks,
...Tao
_________________________________________________________________
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