A. Sathya and Dr. M.S Mythili 2023. Evaluating Sentiment Classification to Specify Polarity by Lexicon-Based and Machine Learning Approaches for COVID-19 Twitter Data Sets . JOURNAL OF ADVANCED APPLIED SCIENTIFIC RESEARCH. 5, 4 (Jul. 2023), 12–27. DOI:https://doi.org/10.46947/joaasr542023678.