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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