I'd like to create a new data set that sums together all the responsetime readings at trial_line 4 and 5. So, in the sample data below, nothing would change for the variables subject and item, but trial_line would go (1, 2, 3, 4, 6, 1, 2, 3, 4, 6) and responsetime would go (395, 409, 398, 766, 401, 343, 343, 343, 679, 409) (bolded for emphasis). I think this is fairly simple to do, but I am unsure how to go about it. data reading2; input subject $ item $ trial_line responsetime; lines; 438 5 1 395 438 5 2 409 438 5 3 398 438 5 4 380 438 5 5 386 438 6 6 401 438 6 1 343 438 6 2 343 438 6 3 343 438 6 4 311 438 6 5 368 438 6 6 409 ;
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