Displaying 1 result from an estimated 1 matches for "muzammil786".
2012 Nov 15
0
problem in fitting model in NLS function
...), trace=T)
fm2 <- nls(y~a2 * ((x-1979)^b2), data=mdat, start=c(a2=1,b2=1), trace=T)
found a possible solution quickly with the last 2 forms. Without
adjusting the x data, you get a very ill-conditioned problem.
JN
> Message: 21
> Date: Wed, 14 Nov 2012 03:04:56 -0800 (PST)
> From: muzammil786 <m.shahbaz at sheffield.ac.uk>
> To: r-help at r-project.org
> Subject: Re: [R] problem in fitting model in NLS function
> Message-ID: <1352891096449-4649473.post at n4.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
> Dear David,
>
> I am having a sim...