Quentin Andre, Assistant Professor of Marketing at the University of Colorado, Boulder, has written a series of blog posts that discuss some of the issues with power analyses and alternate strategies for planning sample sizes. The blog posts can be a bit technical, but they are a good resource for those curious:
- Power Analysis in Consumer Research: A Fool’s Errand?
- Increasing the Informativeness of Power Analysis
- Designing More Efficient Studies with Group Sequential Designs