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same old question - lme4 and p-values

Kevin E. Thorpe

Fri, Apr 11, 2008 6:10 AM

This has been a very interesting thread.  However, I'm still
wrestling with what to do for a fixed-effect that has more than
one degree of freedom.

In the data I'm analyzing, I have three groups to compare.

So, I can get CIs for the two parameters, but that is a bit
problematic for assessing an overall difference.

Is it valid to do the following?  Estimate the parameters using both
ML and REML.  If the estimates show good agreement, is that sufficient
evidence to conclude the ML procedure is converging and that I can
use a likelihood ratio test for the fixed effect?

Thanks for your comments.

Kevin

Kevin E. Thorpe
Biostatistician/Trialist, Knowledge Translation Program
Assistant Professor, Department of Public Health Sciences
Faculty of Medicine, University of Toronto
email: kevin.thorpe at utoronto.ca  Tel: 416.864.5776  Fax: 416.864.6057

Thread (29 messages)

Douglas Bates same old question - lme4 and p-values Apr 4 Martin Henry H. Stevens same old question - lme4 and p-values Apr 4 Reinhold Kliegl same old question - lme4 and p-values Apr 5 Jonathan Baron same old question - lme4 and p-values Apr 5 Reinhold Kliegl same old question - lme4 and p-values Apr 5 Martin Maechler same old question - lme4 and p-values Apr 5 Andy Fugard same old question - lme4 and p-values Apr 5 Robert Kushler same old question - lme4 and p-values Apr 5 Robert Kushler same old question - lme4 and p-values Apr 5 Andrew Robinson same old question - lme4 and p-values Apr 5 John Maindonald same old question - lme4 and p-values Apr 5 Douglas Bates same old question - lme4 and p-values Apr 6 Andrew Robinson same old question - lme4 and p-values Apr 6 Douglas Bates same old question - lme4 and p-values Apr 6 David Henderson same old question - lme4 and p-values Apr 6 John Maindonald same old question - lme4 and p-values Apr 7 Douglas Bates same old question - lme4 and p-values Apr 7 Simon Blomberg same old question - lme4 and p-values Apr 7 Simon Blomberg same old question - lme4 and p-values Apr 7 John Maindonald same old question - lme4 and p-values Apr 7 Jarrett Byrnes same old question - lme4 and p-values Apr 7 Simon Blomberg same old question - lme4 and p-values Apr 7 Simon Blomberg same old question - lme4 and p-values Apr 7 David Henderson same old question - lme4 and p-values Apr 7 Douglas Bates same old question - lme4 and p-values Apr 8 David Afshartous same old question - lme4 and p-values Apr 10 Kevin E. Thorpe same old question - lme4 and p-values Apr 11 Reinhold Kliegl same old question - lme4 and p-values Apr 12 Andrew Robinson same old question - lme4 and p-values Apr 12