The Influence of Sentiment on the Movement of Bank Mandiri (BMRI) Stock Price with Word2Vec Feature Expansion and the Naïve Bayes-Support Vector Machine (NBSVM) Classifier

Sentiment towards a company is suspected of influencing the company's stock price movement. The sentiment is gathered from Twitter, Youtube, Facebook with some news media such as Consumer News and Business Channel (CNBC), Kontan, Detik, Cable News Network (CNN), Stockbit, and Liputan6 which discussed Bank Mandiri. Word2Vec is used to reduce vocabulary errors in sentiment analysis using word embedding. The Word2Vec model was built using the combined corpus of Wikipedia articles and scraped data with a total of 474,277 lines of text data. This study indicates that the correlation between sentiment and stock movements of Bank Mandiri has a positive correlation with a low relationship, indicated by the Spearman Rank test coefficient value of 0.138 and 0.123 for positive and negative sentiment, respectively. The Naïve Bayes-Support Vector Machine (NBSVM) classification model outperforms the Naïve Bayes and Support Vector Machine methods, where the baseline NBSVM gets an accuracy of 64.67%, and after the feature expansion process, the accuracy becomes 70.42%, an increase of 5.75%. This study proves there is a correlation between sentiment and the movement of Bank Mandiri's shares, and Word2Vec feature expansion can increase the model's accuracy.