Thank you Astounding. This is my code: data eeg_inf.out_100_test; set eeg_inf.out_100; starting_time_1 = '10:02:32't; starting_time_2 = '10:08:52't; starting_time_3 = '10:21:04't; if (starting_time_1 <= time <= starting_time_1 + 180) or (starting_time_2 <= time <= starting_time_2 + 180) or (starting_time_3 <= time <= starting_time_3 + 180); run; I get a series of error Messages like this: NOTE: Ungültige numerische Daten, Time='10:05:34', in Zeile 1253 Spalte 24. NOTE: Ungültige numerische Daten, Time='10:05:34', in Zeile 1254 Spalte 24. NOTE: Ungültige numerische Daten, Time='10:05:34', in Zeile 1255 Spalte 24. Translated from the german it means "Invalid numeric data". Is my code right?
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