 
nightlord
Registered: Jan 2003 Posts: 129 
weighted average?
ok something i just noticed when i was voting for alih.
the guy has 6 9's and 3 8's and a 1 from a downvoter. his weighted average turns out to be 7.7.
now if we took the arithmetic average. it would be
(6 x 9) + (3 x 8) + 1 = 79 divided by 10 would be ~ 7.9
so the weighted average function was supposed to be able to recognize downvoting and perform better than arithmetic average. I say something is wrong.
not only the real average should have been somewhere in high 8's, but also the csdb function works even worse than the arithmetic average.
am i making a calculation mistake or something? 

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Perff Administrator
Posts: 1568 
Note taken. Actually there is some kind of this already. :)
If you take a look at the ratings, then those with a high number of votes match the arethmetic average of the votes (perhaps with some extreme fake votes removed first). If you then take a look at the entries with only a few votes, you might notice that their rating is less than the arethmetic average.
Now I'm talking in general terms. There might be a few entries where this is not completly accurate.. 
 
Tch Account closed
Registered: Sep 2004 Posts: 512 
Quote: 10 seems to be a good number.
perff. do you ever plan to make a chart where inactive people are dropped after a certain time?
Hmm,voting doesn´t seem popular.
Must admit that I am not a dedicated voter either.
Raising the bar to 10 votes might be pushing it.
Seeing "Tsunami" only recieving 42 votes,I think a lot of lesser productions will just slip into forgottenness..
It would be a shame.
The barrier of 5 votes seems hard enough to break.
It would be quite ridicilous to see a scene that has been around for over 20 years,be represented by lists with only 50 releases.
The same goes (especially) for scenerlists.
Take a look and see who will be missing.
It´s like creating a history that never happened. 
 
Zyron
Registered: Jan 2002 Posts: 2203 
I second that. 
 
Perff Administrator
Posts: 1568 
As someone might have noticed I have (once again) altered the weighted average algoritm a tiny bit, so for instance MacGyver dosn't get a 10 as cracker.
For now we will leave it at 5 votes as it have been so far.
If you still think some of the ratings looks weird or are unfair then remember the following:
1. The charts here in CSDb are only for the fun of it. The main purpose of CSDb is still information = facts.
2. The more votes, the more accurate the ratings are, so VOTE! and get others to vote too. :) 
 
The Dark Judge
Registered: Dec 2001 Posts: 1875 
Quote: As someone might have noticed I have (once again) altered the weighted average algoritm a tiny bit, so for instance MacGyver dosn't get a 10 as cracker.
For now we will leave it at 5 votes as it have been so far.
If you still think some of the ratings looks weird or are unfair then remember the following:
1. The charts here in CSDb are only for the fun of it. The main purpose of CSDb is still information = facts.
2. The more votes, the more accurate the ratings are, so VOTE! and get others to vote too. :)
I'd vote more if I had the feeling my vote actually counts.
And yes, that's a reference to the transparent voting discussion ;) 
 
Ben Account closed
Registered: Feb 2003 Posts: 163 
Perff, I reckon Bayesian weighing (i.e. using the empirical distribution a priori) will reflect the actual appreciation better than does a rather arbitrary appropriation of probablistic weighing. 
 
Earthshaker
Registered: Sep 2002 Posts: 113 
Quote: Perff, I reckon Bayesian weighing (i.e. using the empirical distribution a priori) will reflect the actual appreciation better than does a rather arbitrary appropriation of probablistic weighing.
Same goes for me! ;) 
 
Bubis Account closed
Registered: Oct 2012 Posts: 10 
I've got a related question, I hope this is the right place to ask.
So, one of my entries got 2x10 and 3x9, how comes that my weighted average is 9.8? What is the formula? :) 
 
Groepaz
Registered: Dec 2001 Posts: 9237 
about time this thread got necroed 
 
Oswald
Registered: Apr 2002 Posts: 4573 
Quote: I've got a related question, I hope this is the right place to ask.
So, one of my entries got 2x10 and 3x9, how comes that my weighted average is 9.8? What is the formula? :)
the formula is secret, to avoid manipulating votings. but it has some secret ingredient against downvoters. so likely alone standing votes, or those not so numerous has less weight 
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