Not reproducible. Tsk!
I really don't know what you are taking about, but some ideas are:
mySSasymp <- function( doba, Asym, lrc ) {
SSasymp(doba, Asym, 0, lrc)
}
Another idea is to use log( time ) rather than time.
--
Sent from my phone. Please excuse my brevity.
On December 27, 2016 6:47:12 AM PST, PIKAL Petr <petr.pi...@precheza.cz> wrote:
>Dear all
>
>I would like to fit SSasymp model to some data by nlme. I did not find
>any clue how to set one of parameters to fixed constant value (R0=0).
>
>One suitable way could be to use SSlogis as it has one parameter zero,
>however it is not correct AFAIK logistics is defined from -Inf to Inf
>and my x value is time, starting from 0.
>
>The only option I found is to define my own growth function which is
>constrained by some fixed starting point. Does anybody know other way
>around? Like persuading nlme not optimize R0 and be happy with the
>value set in the function call.
>
>something like
>
>nlsList(rutrtg ~ SSasymp(doba, Asym, R0, lrc), data=rutil.g,
>start=c(Asym=100, R0= 10, lrc=-2), offset=c(R0=10))
>
>which obviously does not work.
>
>I could put some data but it is more a matter of nlme or other R
>functions then real data.
>
>Looking forward to some answer.
>Happy New year 2017
>
>Petr Pikal
>
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