Data items: tsstate_datetime (in minutes) cat_latency_groepen (categorie, 7 groups) aantal (count per group).   I like to calculate percentage of the first group (lat_0_2) of the total per datetime value( minute, hour, day etc.)   Although I now how to do it in normal SAS code, using the 'New data item ' window isn't straightforward at all.   The function should be something like: SUM(IF ('cat_latency_groepen'n IN ('lat_0_2'), 'aantal'n, 0)) / SUM('aantal'n) * 100   I also tried using IF....ELSE operator as well but that starts off with a IF underneath red. I have no clue using this operator in this interface. And I can't find any helpfull documentation.    What would be the best practice using this interface?       ... View more