Sample Size Calculators

for designing clinical research

Need help? Request a consultation from sample-size.net developer Michael Kohn about sample size calculation, study design, data management, or statistical analysis.

Logistic regression – effect size

This calculator includes functions from the jStat JavaScript library.

This project was supported by the National Center for Advancing Translational Sciences, National Institutes of Health, through UCSF-CTSI Grant Numbers UL1 TR000004 and UL1 TR001872. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the NIH.