Revisiting and expanding the meta‐analysis of variation: The log coefficient of variation ratio

Meta‐analyses are often used to estimate the relative average values of a quantitative outcome in two groups (eg, control and experimental groups). However, they may also examine the relative variability (variance) of those groups. For such comparisons, two relatively new effect size statistics, the log‐transformed “variability ratio” (the ratio of two standard deviations; lnVR) and the log‐transformed “coefficients of variation ratio” (the...