The most common measure of standardized effect size is Cohen's d, where the mean difference is divided by the standard deviation of the pooled observations ( ... ... <看更多>

Measure SMD is not for paired data. See help(escalc) or go to https://wviechtb.github.io/metafor/reference/escalc.html and search for ... ... <看更多>

Effect size would be a population quantity. You can't calculate it, if you're doing a sample size calculation you specify it. You might attempt ... ... <看更多>