For the tone of voice analysis, our training data was a large set of articles from Reuters and Associated Press - both wire services that are used by most news

For the tone of voice analysis, our training data was a large set of articles from Reuters and Associated Press - both wire services that are used by most news outlets. We supplemented this with a dictionary of emotional weights for words and some other heuristics. For author expertise, we classify every article into one of 1000 different topics based on the IPTC taxonomy. We’ve now evaluated about 7M articles creating an expertise database on 50,000 journalists, i.e. what topics have they written on in the past and how much do they focus on that.