Aggregate group-time average treatment effects into overall, group, and dynamic effects. This function is only used for (i) computing standard errors using the empirical bootstrap, and (ii) combining distributions at the (g,t) level
Aggregate group-time average treatment effects into overall, group, and dynamic effects. This function is only used for (i) computing standard errors using the empirical bootstrap, and (ii) combining distributions at the (g,t) level