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Unequal sample size

edited May 2016 in JASP & BayesFactor


Does Bayesian statistics in Jasp accounts for unequal sample sizes when considering the strength of evidence?
If so, how? If not, what is than the best way to deal with unequal sample sizes?

I have used JASP to compare the following groups and studies on one outcome measure using a group*study design.
Study 1: Ngroup1 = 89, Ngroup2 = 26
Study 2: Ngroup1 = 38, Ngroup2 = 41
Note: Variances were equal in these groups.

Thanks in advance!

Marieke van der Schaaf


  • EJEJ
    edited 1:10PM

    Hi Marieke,

    Richard may have more to say about this, but the Bayesian test considers the probability of the data under two competing hypotheses about effect size. This automatically takes into account unequal sample sizes. Note that this is also apparent from Rouder's web-app:


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