According to the evaluation of the MT method (Kanayama et al., 2004), highprecision sentiment analysis had been achieved using the polar atoms and patterns, where the system never took positive sentiment for negative and vice versa, and judged positive or negative to neutral expressions in only about 10% cases.
sentiment Analysis (sA)  is a task to recognize writers' feelings as expressed in positive or negative comments, by analyzing unreadably large numbers of documents.