What do these mean: Avg star score, etc.

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What do these mean: Avg star score, etc.

Postby pink haze » Mon Feb 23, 2009 1:06 pm

I still haven't figured this out. What do the numbers in the star score area mean, and how are they calculated? (I'm just asking about the ones indicated by the arrows--I know the others.) I often organize my vid searches by star rating, so I'm curious.

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Is this explained elsewhere (like, officially)? I checked around a few times, but I couldn't find anything.
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Re: What do these mean: Avg star score, etc.

Postby Nya-chan Production » Mon Feb 23, 2009 1:49 pm

The star averages formulas are written in Top 10% statistics, iirc.

The numbers in brackets are percentiles, meaning how high does that vid lie among other vids based on that star rate. So 60th (87th, 85th) in your example means, that it's rated better than 60% (87%, 85%) of all vids in number of stars (star average, star raw average).
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Re: What do these mean: Avg star score, etc.

Postby pink haze » Mon Feb 23, 2009 4:58 pm

Oh, those are percentiles. That makes sense. Thanks!
Nya-chan Production wrote:The star averages formulas are written in Top 10% statistics, iirc.

You don't mean these equations, do you? (copied from Top 10% Rated Videos page)
Qualified = count(opinions) >= 10

compscore = sum(avg(nonNULL(opinion.category))/count(avg(nonNULL(opinion.category)) except Overall and Re-view

Note: The top and bottom 10% scores are removed from the average calculation (also known as the "Olympic Average")

score = Bayesian Average(avg(compscore+overall+review))

Bayesian Average = (v ÷ (v + m)) × R + (m ÷ (v + m)) × C

where:
R = average for the video (mean) = (old score)
v = number of votes for the video = (votes)
m = minimum votes required to be listed in the top 10% (10)
C = the mean score across all videos (average all vids)

The scores on the top 10% list go up to 10, but the numbers under "Avg (score)" in the star ratings field never exceed 5, so they can't be the same (unless you're supposed to divide one by 2 to get the other). Am I looking in the wrong place?
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Re: What do these mean: Avg star score, etc.

Postby Nya-chan Production » Wed Feb 25, 2009 10:15 am

pink haze wrote:Oh, those are percentiles. That makes sense. Thanks!
Nya-chan Production wrote:The star averages formulas are written in Top 10% statistics, iirc.

You don't mean these equations, do you? (copied from Top 10% Rated Videos page)
Qualified = count(opinions) >= 10

compscore = sum(avg(nonNULL(opinion.category))/count(avg(nonNULL(opinion.category)) except Overall and Re-view

Note: The top and bottom 10% scores are removed from the average calculation (also known as the "Olympic Average")

score = Bayesian Average(avg(compscore+overall+review))

Bayesian Average = (v ÷ (v + m)) × R + (m ÷ (v + m)) × C

where:
R = average for the video (mean) = (old score)
v = number of votes for the video = (votes)
m = minimum votes required to be listed in the top 10% (10)
C = the mean score across all videos (average all vids)

The scores on the top 10% list go up to 10, but the numbers under "Avg (score)" in the star ratings field never exceed 5, so they can't be the same (unless you're supposed to divide one by 2 to get the other). Am I looking in the wrong place?


Yep, I'd expect the formulas being very simmilar, only instead of inserting vote numbers from 0-10, you insert stars from 0-5 (and thus can never go over 5) and of course, there's probably no limit.
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