Hi,
I am trying to do a nls fitting using the SSfpl self-restart function but I got an
error like the following:
> nls.2 <- nls(map.rr ~ SSfpl(mail.pv, phi1, phi2, phi3, phi4), data=pv.rr.200)
Error in nls(y ~ cbind(1, 1/(1 + exp((xmid - x)/exp(lscal)))), data = xy, :
step factor 0.000488281 reduced below `minFactor' of 0.000976562
where phi[-4] are unintialized.
I have tried to use getInitial() first but still got the same error.
Do I miss anything here?
Please advise.
thanks a lot,
Yun-Fang
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