Muhamad Fawwaz Akbar, Muhammad Itqan Mazdadi, Muliadi, Triando Hamonangan Saragih and Friska Abadi 2023. Implementation of Information Gain Ratio and Particle Swarm Optimization in the Sentiment Analysis Classification of Covid-19 Vaccine Using Support Vector Machine. Journal of Electronics, Electromedical Engineering, and Medical Informatics. 5, 4 (Sep. 2023), 261-270. DOI:https://doi.org/10.35882/jeeemi.v5i4.328.