On 7/14/2012 4:11 PM, Gabor Grothendieck wrote:
On Sat, Jul 14, 2012 at 6:53 PM, Spencer Graves
<spencer.gra...@prodsyse.com> wrote:
Hello:
Does "extractAIC.nls" exist anywhere? If no, is there some reason it
should not be used?
I'm planning to add it to the fda package, but before I do, I felt a
need to ask if there is some reason I shouldn't or if there are caveats I
should include in the help page for it.
AIC in stats works on nls objects. It calls AIC.default which calls logLik.nls .
Thanks for the reply. Unfortunately, it fails for me in the
following modification of the first example in help('nls'):
> require(graphics)
> DNase1 <- subset(DNase, Run == 1)
> fm1DNase1 <- nls(density ~ SSlogis(log(conc), Asym, xmid, scal), DNase1)
> extractAIC(fm1DNase1)
Error in UseMethod("extractAIC") :
no applicable method for 'extractAIC' applied to an object of class "nls"
Other suggestions?
Thanks,
Spencer
sessionInfo()
R version 2.15.1 (2012-06-22)
Platform: i386-pc-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
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