We have also been able to combine our findings with the NBSVM classifier for an even better performance on binary classification.
the contents of different sentiment classes in their news domain datasets were drawn from sources which systematically differ from each other not only with regard to their sentiment but also their topic, leading to high topic bias (Brooke & Hirst, 2011;Ferschke, Gurevych, & Rittberger, 2013).