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grasstust
Registered: Apr 2007
Posts: 43 |
Weighted averages wrong?
So, I came across this entry:
Small Chunk
It's (currently) got 6.9 as average.
It's got 6 votes
5 people voted 8
1 people voted 6
8+8+8+8+8+6 = 46
So the average 46 / 6 = 7.6.
Or am I missing something? |
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chatGPZ
Registered: Dec 2001
Posts: 11136 |
you have calculated the mean value =P |
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grasstust
Registered: Apr 2007
Posts: 43 |
The what? |
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chatGPZ
Registered: Dec 2001
Posts: 11136 |
https://en.wikipedia.org/wiki/Arithmetic_mean |
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grasstust
Registered: Apr 2007
Posts: 43 |
Okay... So can you explain how this average is weighted? Or is there somewhere I can read about it? |
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chatGPZ
Registered: Dec 2001
Posts: 11136 |
sorry, no. i honestly dont have an idea what exact algo is used, nor do i give a damn at all =P |
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grasstust
Registered: Apr 2007
Posts: 43 |
:) Ok... I would sort of agree with you; who cares... If it wasn't for the fact that in this case, there are 4 known voters and the 6 vote is anonymous, and still the 6 vote is weighted MORE than the 8-votes...
Strange? |
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chatGPZ
Registered: Dec 2001
Posts: 11136 |
<Post edited by chatGPZ on 11/8-2013 14:11>
whats so strange about it? the only thing it shows (yet again) is that 6 votes are way too few to calculate anything meaningful. |
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grasstust
Registered: Apr 2007
Posts: 43 |
Ah... From 7.6 to 6.9 compared to the mean average I would say is a substantial difference, but it might just be me... |
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Kabuto
Account closed
Registered: Sep 2004
Posts: 58 |
I agree, it's very strange.
Speculating about possible reasons:
* The "6" vote is 6 times as worth as either of the "8" votes
* There's another invisible "2" vote
* There's a "0" vote being worth 0.7 times a regular vote (speculating again: maybe someone added this to prevent prods having just a few votes from entering the toplist) |
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Ejner
Registered: Oct 2012
Posts: 43 |
Some releases get weighted averages that are below the actual average, other releases get weighted averages that are higher.
I guess there's really only Perff who knows exactly how it's calculated. I believe there's a thread where he explains the reasons for the weighted averages somewhere if I recall correctly...? |
