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simix
2006 Jan 06
1
lmer p-vales are sometimes too small
...very small, and probably
spurious, p-values. I realize that lmer is not yet a finished product.
Is it likely that the problem will be fixed in a future release of the
lme4 package?
Using simulated data for a quite standard mixed-model anova (a balanced
two-way design; see code for the function SimMixed pasted below), I
compared the output of lmer, for three slightly different models, with
the output of aov. For an example where there is no fixed treatment
effect (null hypothesis is true), with 4 blocks, 2 treatments, and 40
observations per treatment-block combination, I find that lmer give...