I searced the manual and the forum but couldn't find a solution.
My panel consists of people who registerd for one or several events but I don't know if they attended.
The problem is that the number of possible events differs.
So first question should be a matrix of alle the registerd events from a user, where he can answer if he attended or not.
Second question if they attended would be if they liked it or not, if they don't attended it would by why not.