In this technical blog, Suresh Kumar Gorakala explains how to turn written comments into descriptive sentiment. This is extremely helpful when trying to categorise, segment and understand your audiences better.
This example focuses on Twitter comments, but this technique can be applied to any text field, including telephone call notes and emails.
http://www.dataperspective.info/2013/08/sentiment-analysis-using-r.html?m=1
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