PMI can be exploited as a semantic similarity measure (Han et al., 2013) and it is calculated as: To calculate the PMI value of a candidate word and a specific sense, we consider p(x) as the probability of the candidate word to occur in the corpus.
p(x) is calculated as p(x) = c(x)/N , where c(x) is the total count of the occurrences of the candidate word x in the corpus and N is the total co-occurrence count of all words in the corpus.