I have just completed a pilot study and I need help in determining the required sample size to achieve 0.80 power prior before beginning a full study. The pilot study sample included 6 subjects. Each subject was tested a total of 4 times in one day. There were 2 postures in which they were tested, and within each posture, there were two test conditions (so, a 2x2 repeated measures design). I am using a Repeated Measures ANOVA analysis as my statistical test. I am using SPSS and also have downloaded G*Power 3.1.2. I need help in setting up the data to perform the analysis.
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I am running SPSS v13 on Windows 7.