Correlate the age of the rating, the age of the audience and the age of the film.
Some movies I have rated based on the impression I had watching them when I was a kid. Was it great back then, some tens of years ago? Definitely. Would I watch it today? Hardly.
The MovieLens itself quickly approaches 20 years of age. The first ratings on the movies back then have had been done by the people 20 years younger than they are today.
I am willing to share my year of birth with MoviLens if that would help with the predictions.
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horsh
shared this idea
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randomoneh commented
I really like this idea and I hope it's already used in some capacity.