How many bits per rating?

Daniel Kluver, Tien T. Nguyen, Michael D. Ekstrand, Shilad Sen, John Riedl. How many bits per rating?. In Padraig Cunningham, Neil J. Hurley, Ido Guy, Sarabjot Singh Anand, editors, Sixth ACM Conference on Recommender Systems, RecSys '12, Dublin, Ireland, September 9-13, 2012. pages 99-106, ACM, 2012. [doi]

@inproceedings{KluverNESR12,
  title = {How many bits per rating?},
  author = {Daniel Kluver and Tien T. Nguyen and Michael D. Ekstrand and Shilad Sen and John Riedl},
  year = {2012},
  doi = {10.1145/2365952.2365974},
  url = {http://doi.acm.org/10.1145/2365952.2365974},
  researchr = {https://researchr.org/publication/KluverNESR12},
  cites = {0},
  citedby = {0},
  pages = {99-106},
  booktitle = {Sixth ACM Conference on Recommender Systems, RecSys '12, Dublin, Ireland, September 9-13, 2012},
  editor = {Padraig Cunningham and Neil J. Hurley and Ido Guy and Sarabjot Singh Anand},
  publisher = {ACM},
  isbn = {978-1-4503-1270-7},
}