[R] Piecewise (segmented) linear regression with center section slope constraint

[Drew Morrison]

Thanks, Jean. I've actually looked at that source before. The issue is that I
can't constrain the slope of the /center/ section to be zero - in fact, I've
applied similar code to a three-segment regression and I can get a zero
slope either of the two sides, but not in the middle.

Here's a list of the main resources I've consulted so far:

https://climateecology.wordpress.com/2012/08/19/r-for-ecologists-putting-together-a-piecewise-regression/

http://www.stackoverflow.dluat.com/questions/30060278/creating-piecewise-linear-regression-with-flat-slope-in-r

https://rpubs.com/MarkusLoew/12164



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