Entity-Level Sentiment Analysis of Issue Comments

Emotions and sentiment of software developers can largely influence the software productivity and quality. However, existing work on emotion mining and sentiment analysis is still in the early stage in software engineering in terms of accuracy, the size of datasets used and the specificity of the analysis. In this work, we are concerned with conducting entity-level sentiment analysis. We first build a manually labeled dataset containing 3,000 issue comments selected from 231,732 issue comments collected from 10 open source projects in GitHub. Then we design and develop SentiSW, an entitylevel sentiment analysis tool consisting of sentiment classification and entity recognition, which can classify issue comments into <sentiment, entity> tuples. We evaluate the sentiment classification using ten-fold cross validation, and it achieves 68.71% mean precision, 63.98% mean recall and 77.19% accuracy, which is significantly higher than existing tools. We evaluate the entity recognition by manually annotation and it achieves a 75.15% accuracy.