Reporting an effect size in jamm

[chantelanuit]

Hello,

I was wondering if it could be possible to add in a future release of jamm the upsilon effect size suggest by: Lachowicz, M. J., Preacher, K. J., and Kelley, K. (2018). A novel measure of effect size for mediation analysis. Psychol. Method. 23, 244–261. doi: 10.1037/met0000165

Upsilon is available in MBESS https://cran.r-project.org/web/packages/MBESS/MBESS.pdf

"Mediation analysis has enabled behavioral researchers to better understand the mechanistic relationships between variables. Many researchers are specifically interested in the role of mediators (M) that account for the relation between a predictor variable (X; independent variable) and an outcome variable (Y; dependent variable). A variety of effect size measures have been developed for mediation analysis. However, most of these effect size measures have limitations, including non-monotonicity and spurious inflation. Lachowicz et al. (2018) developed a new effect size measure, upsilon (υ), which has overcome these two limitations. The current study extends its work by applying this effect size metric to mediation models with a multicategorical predictor." cited in https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2023.1101440/full#B13

[mcfanda]

Hi upsilon is simply the square of the beta that you find in jamm tables. So I guess that the beta is enough

[chantelanuit]

Hi

I was referring to that formula that differs from the square of beta (Cao et al., 2023, p. 06):

Cao, Z., Cham, H., Stiver, J., & Rivera Mindt, M. (2023). Effect size measure for mediation analysis with a multicategorical predictor. Frontiers in Psychology, 14, 1101440. https://doi.org/10.3389/fpsyg.2023.1101440

[mcfanda]

let's wait for some more confirmations