In the process I had been pointed towards UNIQUEBY. I managed to solve this for a single condition. It, indeed, runs a lot quicker than the previous solution unique-loc. But, again, adding a second condition is so far unsolved or deliveres wrong results. For each ID I would like the sum of euro for dummy1 = 1. Where am I going wrong?
Of course, I could create new variables (newvar = id + dummy1) and then run the programme over this variable, but that is not preferred.
Thank you for your help. I trust your judgement and will apply accordingly.
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