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Dataset belongs to Dataset for “User personality and user satisfaction with recommender systems”: Nguyen, T.T., Maxwell Harper, F., Terveen, L. et al. Inf Syst Front (2018) 20: 1173. https://doi.org/10.1007/s10796-017-9782-y
for further info refer to https://grouplens.org/datasets/personality-2018/