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Seven
Registered: Jan 2002
Posts: 202 |
Voting System: Weighted Averages?
I'm still somewhat confused about this weighted average thing, somebody willing to explain how this is calculated? =) |
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anonym
Registered: Jan 2002
Posts: 267 |
I just noticed something else. Groups the charts that have the same amount of points are still ranked on different spots, even though they should be on the same.
/Frank |
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Perff
Administrator
Posts: 1679 |
To both Frank's (anonym) posts:
1: The reason that sometimes the "Top Coders" shows up is that this place is used for general scener ratings.
What happens is that a random profession is selected, and then the best 5 in this profession is listed.
That leads us to the next problem. There arn't that many votes on sceners, so there are almost never anything in this position.
VOTE PEOPLE!
2: About the equal votes.
The votes that is listed is rounded number of the real WA, so even padua and crest at present time both got 7.7 according to the "Top Groups" they don't got the same exact rating.
Pauda got: 7.7109...
Crest got: 7.7086...
I think it would be nasty to display all theese decimals, so you just have to trust the rating. :)
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Seven
Registered: Jan 2002
Posts: 202 |
...which, btw., nicely demonstrates the flaw of the WA... looks like someone seriously downvoted Crest by casting a single vote...
or am I mistaken? |
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Perff
Administrator
Posts: 1679 |
Quote: ...which, btw., nicely demonstrates the flaw of the WA... looks like someone seriously downvoted Crest by casting a single vote...
or am I mistaken?
Nope. :/
You are absolutly right about this.
If there are a lot of votes on something this dosn't mean anything, but this is not the case.
As I sugested earlier an option is to look away from the best/worst votes when calculating the WA.
Anyone got other ideas? |
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Seven
Registered: Jan 2002
Posts: 202 |
I still think a normal vote average is less influented by these kinda things... |
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CyberBrain
Administrator
Posts: 392 |
I think normal average would suck. If a group had 3 votes of, let's say, 7 each, and a group had 30 votes of 7 each, both groups would be on the same place with normal average, even though only 3 people voted on the first group. (so f.e. just a few "not well thoughtout"-votes would dramatically change the charts, and it wouldn't show anything about what most people would think (when 3 votes would give the same weight as 30 votes).
WA *MUCH* better represents the votes, in my oppinion.
About the WA problem: Cutting off the 10% lowest/highest is certainly better than nothing.
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Seven
Registered: Jan 2002
Posts: 202 |
why not cut off *all* the votes?
why should I care to vote at all when my votes get cut off anyway?
yes, 3 votes with an average of 7 is the same as 10 votes with an average of 7... people don't like this - cast a vote yourself... but at least this way a single vote does not affect a rank _as_ much as is the case with the Crest downvote...
do your math? |
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CyberBrain
Administrator
Posts: 392 |
I don't understand the WA problem (and i don't know how WA is calculated, but judging from how WA should work). I would think that with WA if a single vote was far from the others, it would *not* affect the rating as much as normal average (and thereby not put Crest to the bottom of the charts just because of one vote)
Obviously this is not the case?
If not, it should be taken into consideration in the WA formula. |
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chatGPZ
Registered: Dec 2001
Posts: 11384 |
1) talking of something like "weighted averages" is total BULLSHIT unless you tell us how its calculated. pronto presto pretty please! :o)
2) i agree that using something like quadratic- or cubic- average is probably better for calculating "true" numbers
3) averages shouldnt be shown at all until atleast a certain amount of ppl (10 or so) have voted. with less votes, you may just as well use a dice :o) |
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Flex
Registered: Feb 2002
Posts: 111 |
To prevent "downvoting" etc. misbehaviour, why shouldn`t we have a some kind of a register for that.
Would be nice to see who has voted and how... |
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