Segmented regression analysis

[ArmandoTasistro]

What SAS Procedure can I use to analyze data like shown in the graph. The dependent variable initially responds to the independent one, but after a certain value it does not. How can I determine the statistical relationship between y and x in the response zone, the value of x after which y does not respond to x, and the y value in the no change zone?

[PaigeMiller]

Here's an example

https://documentation.sas.com/?docsetId=statug&docsetVersion=14.2&docsetTarget=statug_nlin_examples0...

[ArmandoTasistro]

Thank you Paige, but that example is for a quadratic-plateau response, and I am interested in a linear-plateau one, i.e. two straight lines.

Armando

[PaigeMiller · Accepted solution]

It should be relatively easy to modify PROC NLIN code to use a straight line. The example fits your problem perfectly once this modification is made.

[ArmandoTasistro]

Thank you, Paige!

Armando