On Jan 12, 2013, at 3:30 PM, Ahmed Attia wrote:
Please help getting the R squared value in asymptotic regression model
I use the code below
model1<-nls(GN1~SSasymp (nrate,a,b,c), data = data.1 )
and R produced the modell coefficients without the R squared value?
What makes you think there should be an R^2 value?
From the archives:
https://stat.ethz.ch/pipermail/r-help/2002-July/023461.html
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2892436/
From the background section to that article:
"Although it is known now for some time that R2 is an inadequate
measure for nonlinear regression, many scientists and also reviewers
insist on it being supplied in papers dealing with nonlinear data
analysis. Several initial and older descriptions for R2 being of no
avail in nonlinear fitting had pointed out this issue but have
probably fallen into oblivion [2-8]. This observation might be due to
differences in the mathematical background of trained statisticians
and biochemists/pharmacologists who often apply statistical methods
but lack detailed statistical insight."
--
David Winsemius, MD
Alameda, CA, USA
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