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@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.
