mean of participants in the experimental/exposed group.
mean_nexp
mean of participants in the non-experimental/non-exposed group.
mean_sd_exp
standard deviation of participants in the experimental/exposed group.
mean_sd_nexp
standard deviation of participants in the non-experimental/non-exposed group.
n_exp
number of participants in the experimental/exposed group.
n_nexp
number of participants in the non-experimental/non-exposed group.
reverse_means_variability
a logical value indicating whether the direction of the generated effect sizes should be flipped.
Details
This function converts the means and standard deviations of two independent groups into a log variability ratio (VR) and a log coefficient of variation ratio (CVR).
The formulas used to obtain the log VR are (formulas 5 and 15, Senior et al. 2020):
Senior, A. M., Viechtbauer, W., & Nakagawa, S. (2020). Revisiting and expanding the meta-analysis of variation: The log coefficient of variation ratio. Research Synthesis Methods, 11(4), 553-567. https://doi.org/10.1002/jrsm.1423