Sentiment score : percent of positive publications + percent of neutral publications.
Percent of positive publications : (number of positive publications * 100)/ number of publications analyzed.
Percent of negative publications : (number of negative publications * 100)/ number of publications analyzed.
Percent of neutral publications : (number of neutral publications * 100)/ number of publications analyzed.
Percent of mixed publications : (number of mixed publications * 100)/ number of publications analyzed.