topic nonlinear piecewise regression in Statistical Procedures

nonlinear piecewise regression

esraa1 — Thu, 26 Mar 2020 20:44:29 GMT

Hi! I have the data below and I was applied the linear regression (piecewise regression), I wonder if I can apply the piecewise nonlinear regression by SAS.

Re: nonlinear piecewise regression

PaigeMiller — Thu, 26 Mar 2020 22:28:40 GMT

Example:

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

Re: nonlinear piecewise regression

Ksharp — Fri, 27 Mar 2020 11:08:10 GMT

It looks like you need Forecast Model (SAS/ETS) .
Try post it at Forecast Forum .

Or @Rick_SAS may have some thought .

Re: nonlinear piecewise regression

Rick_SAS — Fri, 27 Mar 2020 11:34:49 GMT

This is a continuation of a previous thread, but this time the OP is asking for nonlinear regression.

You say "nonlinear regression," but I suspect you mean either polynomial regression (fit a quadratic or cubic curve) or nonparametric regression (fit a smooth curve). Both can be accomplished using the same tip you got earlier: In PROC SGPLOT

use the REG statement and the DEGREE=3 option to fit a cubic polynomial to the data.
use the LOESS statement to fit a smooth curve to the data.

Here is a link to the SGPLOT documentation about fitting curves in PROC SGPLOT