Hi, I am trying to undertake the Games-Howell test with the Add-in, however always receive the error notificiation: "Argumentwert ist ungültig bei Zugriff oder Auswertung von group1 , group1/*###*/" (sorry, it is in German - it says something like argumentation value is invalid or the evaluation of Group 1, Group 1/*###*/). What does that mean? What is the problem? The add-in is generally functioning because when I try it out with another column it functions (the only difference is that there is somewhat more data in the column that works, but basically it is the same kind of type of data, i.e. just numbers). I would be very grateful if someone could help me.