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curve fit
3 messages · Xiaodong Jin, Janusz Kawczak, Gabor Grothendieck
There are infinitely (uncountably) many of them. Which one do you want? jk/
On Thu, 20 Oct 2005, Xiaodong Jin wrote:
How to obtain the FUNCTION for the following smooth curve? x 0 100 250 500 1000 4000 y 1.8 1.2 1.02 0.99 0.97 0.85 Thanks, SJ --------------------------------- [[alternative HTML version deleted]]
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y ~ 1/(a + b*x^c) looks pretty good to me. If we assume a starting value of c=1 then we can get the starting values of a and b from lm(1/y ~ x) and then do an nls fit.
On 10/20/05, Xiaodong Jin <close2ceo at yahoo.com> wrote:
How to obtain the FUNCTION for the following smooth curve?
x 0 100 250 500 1000 4000
y 1.8 1.2 1.02 0.99 0.97 0.85
Thanks,
SJ
---------------------------------
[[alternative HTML version deleted]]
______________________________________________ R-help at stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html