From the Center for Pain Studies, Rehabilitation Institute of Chicago/Northwestern University Medical School, Chicago, IL (Dr. Houle); Department of Psychiatry and Human Behavior, and Head Pain Center, University of Mississippi Medical Center, Jackson, MS (Dr. Penzien); and Sargent & Lundy Engineers, LLC (Mr. Houle).
Statistical Power and Sample Size Estimation for Headache Research: An Overview and Power Calculation Tools
Article first published online: 9 JUN 2005
Headache: The Journal of Head and Face Pain
Volume 45, Issue 5, pages 414–418, May 2005
How to Cite
Houle, T. T., Penzien, D. B. and Houle, C. K. (2005), Statistical Power and Sample Size Estimation for Headache Research: An Overview and Power Calculation Tools. Headache: The Journal of Head and Face Pain, 45: 414–418. doi: 10.1111/j.1526-4610.2005.05092.x
- Issue published online: 9 JUN 2005
- Article first published online: 9 JUN 2005
- Accepted for publication January 11, 2005.
The present article reviews the concept of statistical power analysis for research designs in headache. First, we present a basic overview of the concepts of statistical hypothesis testing. Then we discuss the elements of power analysis and, where appropriate, we address conventions for power calculations. We offer, for public use, an applied power calculator for two applications that are often encountered in headache research. We intend to help headache researchers design trials with adequate statistical power by offering a conceptual overview and the power calculators. In closing, we briefly address the implications of the present trend toward reporting point estimates of effect sizes with confidence levels.