Free statistical calculators

Sample size for Comparison of two ROC curves

Input
Type I error - Alpha:
Type II error - Beta:

Area under ROC curve 1:
Area under ROC curve 2:
Correlation in positive group:
Correlation in negative group:
Ratio of sample sizes in negative/positive groups:
Result
Number of cases required in positive group:
Number of cases required in negative group:
Total sample size (2 groups together):

MedCalc Software Ltd. Sample size for Comparison of two ROC curves. https://www.medcalc.org/calc/sample-size-comparison-of-2-roc-curves.php (Version 23.2.1; accessed March 25, 2025)