[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

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