Bayes Factor for Grouped or Two-Sample t-Tests


Sample Size for Group 1:

Sample Size for Group 2:

t-value :

Scale r on effect size:



Summary: This calculator computes Bayes factor for grouped or two-sample t-test designs.

Priors: Outputs are provided for three priors:
i. Jeffrey-Zellner-Siow Prior (JZS, Cauchy distribution on effect size)
ii. Unit-Information or Scaled-Information Prior(Normal prior on effect size)

Citation/Details Rouder, Speckman, Sun, Morey and Iverson (2009)

Questions: rouderj@missouri.edu

Support: NIH R01-MH071418 and NSF SES-0720229.

Last Update 6/10.