Clarification for Single-Group SMN calculation
I am using the effect size computation for the single group standardized mean (SMN). However, I am struggling to understand how the values are calculated. I have attempted to search online and cannot find an equation provided for JASP specifically.
From my understanding, the equation should be the mean difference divided by standard deviation, but that isn't aligning with the values I obtained. Could someone provide documentation that clarifies how values are calculated for the different effect size calculations in the software?
I greatly appreciate any help!
Comments
Do you have a concrete data set or screenshot you could share?
Yes! Here is a screenshot including the effect values generated by JASP.
While I have the discussion open, would you be able to clarify if converting the effect sizes is necessary? These values are on the same scale and represent a ratio (compared to experimental control) already. From what I have read - the values must be standardized in order to follow the assumptions of a meta-analysis. However, if they are already on the same scale, I don't understand the benefit of further modifying them when I could plug the value and SD into the meta-analysis software directly. I am using a Bayesian model so a heterogenous population is accounted for.