Based on the classification scores for the sentences in each review, we derived the average probability AvgProb(r) of the review r being subjective defined as the mean value of the
Prsubj(si) values for the sentences s1, . . . , sn in the review r. Since the same review may be a mixture of objective and subjective sentences, we also kept of standard deviation DevProb(r)
of the subjectivity scores Pr subj(si) for the sentences in each review.