A tip by legendary stat consultant Michael Mitchell pointed us to a little gem of a program, Optimal Design.
Optimal Design does power analysis for a wide variety of multilevel level and repeated measures designs. The program is a product of the Survey Research Center of the Institute of Social Research at the University of Michigan. The program is fast, easy to use, and the best part, it's free. You can find out about it at http://sitemaker.umich.edu/group-based/optimal_design_software.
This program comes at an opportune time for us since ATS Stat Consulting will be giving the first of three presentations on power analysis starting next Wednesday, February 14, 2007 at 10am. The other two presentations will be Feb 14th and Mar 7th.
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