Hi,
could anyone please tell me if is it possible to group over one variable and then use another group in same table.
I would like to obtain results like that:
GroupVar1 - first level grouping variable
Var2 - sum of var2 in datasets grouped by GroupVar1
GroupVar3 - second level grouping variable
Var4, Var5 - sum of variables grouped by GroupVar1 and GroupVar3
Thank you.