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  1. H

    randomized crossover design: combining session conditions

    I am trying to figure out the appropriate method of collapsing two of four session conditions for a randomized crossover trial. We had four session conditions (a, b, c, d) and unfortunately discovered that the same condition was provided twice and we technically only have three unique session...
  2. H

    Calculating sample size for exploratory model including moderators for repeated measures study

    I have been researching ways to calculate the necessary sample size to detect moderators - gender (2 levels) and education (3 levels). The study has two primary groups with 6 repeated measures. The primary outcome of interest is test score. We want to include gender and education in the model...