memasa
Asked 6 years ago
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Rounding average ratings
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[archived]
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EXAMPLE: The average rating of Village is 3.3, however the rating represented in stars is 3 and a half stars. Don't you think there should only be 3 stars visible?
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Answers
Andemon
Answered 6 years ago
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Um... no?
3.3 is closer to 3.5 than 3.0.
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memasa
Answered 6 years ago
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On the other hand it could also be rounded down, 3 is lesser than 5.
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Andemon
Answered 6 years ago
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I suppose it could, if one used some bizarre rounding rules that I've never heard about. What you're suggesting is to floor it, and that's utterly different function - and it'd make absolutely no sense. Why make the average rating less accurate?
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memasa
Answered 6 years ago
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I don't mean to sound like an asshole (which I may as well be), but if you score 100% in the following test, you'll get my idea. This is how it's usually done, thus this topic is valid. Another question is, is this the better way for this site.
http://www.tkukoulu.fi/~jpaakkin/harjoitukset/desipyor.htm
Back to Movielens
Only when a rating is accurately a whole number and a half, a half of a star should also be visible, in other case, the star rating is either rounded up or down to the nearest whole number. Yet the decimal rating is not rounded i.e. this is just a matter of how many stars are shown.
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Andemon
Answered 6 years ago
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Checked the link.
That's basic rounding, and doesn't apply in this case. MovieLens rounds to nearest half-integer instead of full integer, to match the star-scale they use. That is, as far as I can see, the most logical method to use here.
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This question is closed to new answers.
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