On 13/10/11 21:26, Redding, Matthew wrote:
Hi Rolf and others
Will this make any difference to the convergence?
I have no idea, really. I don't know if convergence issues even
arise in the context of the "segmented" package. I have never
encountered any.
Try it and see. Shouldn't take more than about 10 minutes, all up.
cheers,
Rolf
----- Original Message -----
From: Rolf Turner<rolf.tur...@xtra.co.nz>
To: Redding, Matthew
Cc: r-help@r-project.org<r-help@r-project.org>
Sent: Thu Oct 13 18:04:53 2011
Subject: Re: [R] nls: singular convergeance
On 13/10/11 18:02, Redding, Matthew wrote:
Dear R-experts,
I have 28 data points that I would like to fit with a non linear
broken-stick -- with three fitted parameters.
When I view trace -- and use the final values as lines on the graph of
data -- it looks pretty good.
Q1. Why am I getting singular convergeance?
Q2. Can you suggest another approach that may prove more satisfying?
<SNIP>
Have you thought of using the "segmented" package instead
of rolling your own with nls?
cheers,
Rolf Turner
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