evaluating variance functions in nlme

Yes, this probably should go to R-help, and before you do that, I 
suggest you PLEASE do read the posting guide! 
http://www.R-project.org/posting-guide.html.  It can increase the 
likelihood you will get a useful reply relatively quickly.

	  I tried the your two calls to "gnls", which of course produced errors 
for me as I don't have your data.  The help page for "gnls" included an 
example that looked quite similar to me:

 >      fm1 <- gnls(weight ~ SSlogis(Time, Asym, xmid, scal), Soybean,
+                  weights = varPower())
 >      summary(fm1)>      fm1 <- gnls(weight ~ SSlogis(Time, Asym, 
xmid, scal), Soybean,
+                  weights = varPower())
 >      summary(fm1)

	  Those results plus "str(fm1)" looked like they might help answer your 
question.  However, I don't understand enough of what you are asking to 
say.

	  If an answer might still be worth pursuing to you, I suggest you read 
the posting guide and submit a question following that model to r-help.

	  spencer graves

evaluating variance functions in nlme

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