search for: cyuan

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2010 Oct 25
3
question in using nlme and lme4 for unbalanced data
...tr) gld_rm enf_rm guild_remvl -0.707 enfa_removl -0.707 0.500 gld_rmvl:n_ 0.535 -0.756 -0.756 I really appreciate any suggestion! Thank you! -- Chi Yuan Graduate Student Department of Ecology and Evolutionary Biology University of Arizona Room 106 Bioscience West lab phone: 520-621-1889 Email:cyuan at email.arizona.edu Website: http://www.u.arizona.edu/~cyuan/
2009 Dec 17
2
Testing equality of regression model on multiple groups
Hello, I'm trying to test for the joint equality of coefficients of the same model across different subsets of the data (ie, is it necessary to estimate the same model on these different populations, or can I just estimate the model once on the whole dataset?). My plan is to use the F-test on the reduced model and the full model. By full model, I mean a specification that mimics my