[R] force glm estimates to be nonnegative

From: Michele Christina Itten <mitten_at_andrew.cmu.edu>
Date: Fri, 25 Apr 2008 00:37:26 -0400 (EDT)


Is there a way to force certain formula parameters to be nonnegative?

What I want to do is to estimate student capacity over time, namely by

> capacity ~ Student + Student:Day

I add this formula to a glm call and obtain negative learning slope estimates (Student:Day) in some cases. However, I don't want to allow for that. In such a case, glm should solve

> capacity ~ Student

and I will set the slope to zero.

Is there an option to constrain a parameter set to nonnegative values?

Many thanks in advance!

Michele Itten,
BS. Carnegie Mellon



R-help_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Fri 25 Apr 2008 - 04:43:05 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Fri 25 Apr 2008 - 08:30:33 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive