[R-sig-ME] Problems withestimationg model in lmer

Douglas Bates bates at stat.wisc.edu
Thu Feb 14 19:17:32 CET 2008

Thanks for sending the data with your report,  Nicholas.  I found it
very interesting, especially as a group of us are conducting a reading
course using Deepayan Sarkar's forthcoming book "Lattice: Multivariate
Data Visualization with R" (Springer, 2008).  (The book is due out
next month - Deepayan was kind enough to let us use a preprint copy
for the course.)  I enclose a plot of these data and the R code that
generates the plot.  It is interesting because it shows a thresholding
kind of behavior.  There is not much effect for dose until about 1.25
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