Category Archives: Parallel Group

14. Great and Not so Great Designs

Common Designs to Reduce Error Variance Contra-lateral Design This is a very sweet type of study design, but it can be seldom used in pharma or biotech.  Devices are another story.  With only one group (rather than two) and the … Continue reading

Posted in Analysis of Covariance, Contra-lateral, Crossover, Design, Effect Size, Parallel Group | Leave a comment

23. Small N study to publish or not?

The following question was sent to me, I thought it useful enough for a full elaboration: Submitted on 2014/05/12 at 8:23 am Dr. Fleishman, I am so happy I found your site. I have been trying to decide how to best … Continue reading

Posted in assumptions, Confidence intervals, Design, Effect Size, non-parametric statistics, Ordinal, p-values, Parallel Group, Power, t-test, Treatment Effect | 1 Comment