Bi-linear Regression- Model fitting

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saed
saed 2014-8-12
回答： Image Analyst 2021-1-18
Hi every body I simply have a response variable (y) that I am trying to predict with one explanatory variable (x) but the shape of the scatter plot is distinctly bi-linear. It would be best described by two straight lines. Is there a way of fitting a linear model to give me a bi-linear fit? Is there any command in Matlab for this kind of regression?

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回答（3 个）

Image Analyst
Image Analyst 2021-1-18
See attached demo, that I've posted many, many times before. The algorithm is I divide the data into two sections (left and right) and fit lines to each section. Then I find the point where the slope difference is greatest. This is where the data should be split.
Ahmet Cecen
Ahmet Cecen 2014-8-12
That sounds like a problem that would be better solved with a clustering or classification tool rather than regression. If you really need the individual lines, I would first do a classification run followed by linear regression.
Ameer Hamza
Ameer Hamza 2021-1-18
bisection method

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