[R-sig-ME] Power calculations for lmer mixed designs
Diana Michl
dmichl at uni-potsdam.de
Mon Jun 19 15:06:58 CEST 2017
Dear List,
I want to do a power calculation on a mixed model as described here by
Ben Bolker: https://rpubs.com/bbolker/11703
However, there are three things I can't figure out:
- The qlogis function, I don't get what it does exactly and what to
enter instead of 0.7 as in the example
|beta <- c(qlogis(0.7), -0.2)|
- What exactly the resulting graphs mean, both here and in my own
example. What does the read bar at -0.2 tell me? Is there a way to give
power as a number between 0 and 1?
- How to do this for more than 1 treatment (my attempts to do it for 4
all failed, I seem to miss places in the exampe I need to change. For
example, I tried adding values to the beta-qlogis line above and others,
but it gave errors)
Thanks very much for any input!
Diana
--
Diana Michl, M.A.
PhD candidate
International Experimental
and Clinical Linguistics
Universität Potsdam
www.ling.uni-potsdam.de/staff/dmichl
www.duoinfernale.eu
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