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2004 Sep 05
1
Question to NLME, ML vs. REML
Dear all,
I am planning to use nlme library for analysis of experiments in semiconductor
industry. Currently I am using "lm" but plan to move to "lme" to handle
within wafer / wafer-to-wafer and lot-to-lot variation correctly.
So far everything is working well, but I have a fundamentel question:
NLME offers "maximum likelihood" and "restricted maximum likelihood" for
parameter estimation. ML has the advantage, that likelihood ratios can be
computed even with changes in model structure. In addition, ML works with the
stepAIC function from MASS-library whic...