Esmeralda, Irtha Bella2023-08-102023-08-102023-06PerpustakaanElfitrahttps://repository.unri.ac.id/handle/123456789/11115Omicron is a new variant of the Corona virus that was first reported to the World Health Organization (WHO) from South Africa on November 24, 2021. The amount of information related to the Omicron virus that is spread in the form of text on the internet and on social media sites like Twitter is of interest to researchers. This study aims to determine public sentiment from Twitter users about the omicron virus, then determine sentiment classification using the Nave Bayes Classifier and calculate the level of accuracy of the method in sentiment analysis. The data used is 1350 data points using two data testing scenarios, namely the first scenario, Split Validation, using a data ratio of 70%:30%, 80%:20%, and 90%:10%. The second scenario uses cross-validation, divided into 10 tests. Sentiment classifiers are divided into three classes: neutral, fearful, and fearless. The classification process is carried out by means of data pre-processing and weighting using the TF-IDF technique. The final results of the classification process get the highest accuracy values of 85%, 81% precision, and 86% recall in the split validation test with a 90:10 data division. Testing data with cross-validation resulted in the highest accuracy of 93,1% accuracy, 36,6% precision, and 98% recall, with a fold value of 1.enSentiment AnalysisCross ValidationFoldSplit ValidationNaïve Bayes ClassifierOmicronTF-IDFData TestingTwitterVirusArticle