Hello,

I was wondering if someone could point me to the right direction to conduct a power analysis for a design that includes (Levels): One Within Subjects Factor (Time(4)), Two Between Subject Factors (Treatment(2), Dosage(2)), one covariate (Language Skill at Baseline (4)). Random Effects for Intercept and Slope are typically seen in similar studies so I would like to include them as well.
I spent some time with PASS 13 but it will not allow me to incorporate the covariate so I turned to R.
Any ideas, thoughts, suggestions would be greatly appreciated.

Thank you,
Gerasimos
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Gerasimos Fergadiotis, PhD., CCC-SLP
Assistant Professor
Speech & Hearing Sciences
724 SW Harrison St., RM 84B
Portland State University
Portland, Oregon 97201
Phone: 503.725.2217
Fax: 503.725.9171
Web page: http://aaldresearch.wix.com/aald
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