EID AL-FITR INFLUENCES THE NUMBER OF TRAIN PASSENGERS ON THE SUMATRA ISLAND (CALENDAR VARIATIONS TIME SERIES MODEL) - Akbar, Muhammad; Safira, Dinda; Fadhilah, Rahmi; Damayanti, Salma; Riskianto, Riskianto; Puthy, Khem (BAREKENG: Jurnal Ilmu Matematika dan Terapan, 2024)