Document classification is closely related to sentiment analysis. In both cases, we're classifying documents into categories using their text. It's really only the why that changes. Document classification is all about classifying a document based on its type. The world's most obvious and common document classification system is a spam filter, but that has many other uses.
One of my favorite uses of document classification is in settling the debate around the original authors of The Federalist Papers. Alexander Hamilton, James Madison, and John Jay published 85 essays under the pseudonym Publius in 1787 and 1788 supporting the ratification of the United States Constitution. Later, Hamilton provided a list detailing ...
