One of the more interesting types of analytics to be developed in recent years is sentiment analytics. At the National Research Council, for example, we have developed a mechanism for detecting the sentiment of a tweet. This project by David T. Jones uses the Indico sentiment analysis tool to evaluate the sentiment of blog posts. But what does it all mean? Well, it could be used as a tool to detect problems. "The 'red' blog post from the image above included words like "epic fail". It tells the story of how the student had problems getting the new software for the course working. It shows as the third post the student made in the semester."
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