topic Re: Segmented regression analysis in Statistical Procedures

Segmented regression analysis

ArmandoTasistro — Thu, 07 May 2020 21:39:45 GMT

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?

Re: Segmented regression analysis

PaigeMiller — Thu, 07 May 2020 23:09:58 GMT

Here's an example

https://documentation.sas.com/?docsetId=statug&docsetVersion=14.2&docsetTarget=statug_nlin_examples01.htm&locale=en

Re: Segmented regression analysis

ArmandoTasistro — Fri, 08 May 2020 13:52:04 GMT

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

Re: Segmented regression analysis

PaigeMiller — Fri, 08 May 2020 14:13:11 GMT

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.

Re: Segmented regression analysis

ArmandoTasistro — Tue, 12 May 2020 13:36:56 GMT

Thank you, Paige!

Armando