Explanation for how number of people with favourable outcomes is calculated

[befriendabacterium]

Hi Kristoffer

Your Cohen's D interpretability machine/visualiser is great - I'm trying to use it to make the results of my meta-analysis more understandable. The explanations of formulas used are really handy, too. I've two questions which I'll post as separate issues, the first of which is:

Could you please write up an explanation of how the last sentence ('This means that if there are 100 people in each group, and we assume that 20 people have favorable outcomes in the "control" group, then 20 + 12.9 people in the "treatment" group will have favorable outcomes.') is computed please?

Thanks!
Matt