Eddy, T. and Open Darnius 2025. Adjusting Anomalies in International Tourist Arrivals to North Sumatra During the Peak COVID-19 Period (April 2020 to June 2022) to Enhance the Validity of Time Series Modeling. Journal of Research in Mathematics Trends and Technology. 7, 2 (Sep. 2025), 72–77. DOI:https://doi.org/10.32734/jormtt.v7i2.21718.