I want to calculate the standard error of d, VR, and Proportion ratios. And I'm looking for the standard error formula of them? (if it's possible all of them by using the Jackknife) (there are two independent groups) 1. d = standard mean differences 2. VR (variance ratio) VR = variance of group A / variance of group B 3. Proportion ratios: For example the ratio of the top 10% subjects The ratio of the top 10% subjects = their frequency in group A / their frequency in group B Please let me know if there are some mistakes in my question.