Optimal Fit: Two Conn. Lines w/ Diff. Slopes

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Michael
Michael 2013-11-16
评论： Michael 2013-11-20
Hello,
If my data are distributed like two lines who intersect i.e. one line goes until some point, and at that point another line emerges with a different slope (they share the same sign).
Is there a way to find
  1. equations of each of the lines
  2. an estimate of the crossover x-value which lies between each curve
  3. a fit goodness measure (Sigma, or chisq?)
I've been looking online for awhile online and I haven't found anything. Any help would be much appreciated.
Thanks,
Michael

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回答（1 个）

Matt J
Matt J 2013-11-16
So basically you're looking for a 1st order spline fit? This FEX submission would be applicable
http://www.mathworks.com/matlabcentral/fileexchange/25872-free-knot-spline-approximation

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