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Movielens 20M contains about 20 million rating records of 27,278 movies rated by 138493 users between 09 January,1995 to 31 March 2015 . Each user has rated a movie from 1 to 5, where 1 being the worst and 5 is the best. In this study we have considered only positive ratings we have considered higher than 2 as positive rating.
Khushnood Abbas (Tue,) studied this question.