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31343
2008 Apr 25
2
force glm estimates to be nonnegative
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