A joint model for annotation bias and document classification is presented in the context of media sentiment analysis. We consider an Irish online media data set comprising online news articles with user annotations of negative, positive or irrelevant impact on the Irish economy. The joint model combines a statistical model
for user annotation bias and a Naive Bayes model for the document terms. An EM algorithm is used to estimate the annotation bias model, the unobserved biases in the
user annotations, the classifier parameters and the sentiment of the articles. The joint
modeling of both the user biases and the classifier is demonstrated to be superior to
estimation of the bias followed by the estimation of the classifier parameters.
Paper presented at the DAGM-GfKl/IFCS 2011, Joint Conference of the German Classification Society (GfKl)
and the German Association for Pattern Recognition (DAGM), August 31 to September 2, 2011 and at the IFCS 2011 Symposium of the International Federation of Classification Societies (IFCS), August 30, 2011, Frankfurt am Main, Germany
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