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Nightlord
Account closed
Registered: Jan 2003
Posts: 131 |
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: 1679 |
I can see how that looks strange.
I just took a look at the algorithm that calculates the rating, and I found a little thing that might be an improvement.
Now the rating is 8.5, which should be a lot better than 7.7. :)
It's still not the perfect 8.6666666666... as it should be if you removed the 1, and made a regular average, but at least it's close. More (real) votes will bring it even closer.
I recalculated the rating for all entries in CSDb, and my little alteration had no effect on the top entries in the charts. It only had an effect on entries with few votes where there was some very extreme votes, like in this case. |
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WVL
Registered: Mar 2002
Posts: 902 |
Quote: I can see how that looks strange.
I just took a look at the algorithm that calculates the rating, and I found a little thing that might be an improvement.
Now the rating is 8.5, which should be a lot better than 7.7. :)
It's still not the perfect 8.6666666666... as it should be if you removed the 1, and made a regular average, but at least it's close. More (real) votes will bring it even closer.
I recalculated the rating for all entries in CSDb, and my little alteration had no effect on the top entries in the charts. It only had an effect on entries with few votes where there was some very extreme votes, like in this case.
no effect? :) Perff finally managed to kick Crossbow and Graham out of the top 3 coders :DD |
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Perff
Administrator
Posts: 1679 |
Hmmm... oups! :) Missed that. hmm.. checking.. |
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WVL
Registered: Mar 2002
Posts: 902 |
Quote: Hmmm... oups! :) Missed that. hmm.. checking..
why check that? :) I like it ;) now they have to come up with another cool demo to gain some points :) |
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Perff
Administrator
Posts: 1679 |
Just checking if my alteration made people with only bad votes get a rating of 15 or something. ;P
But except for the two people with very few votes (always hard to do a good calculation on few data), I can't see that the rating calculated is unfair, so Graham & Crossbow better shape up! ;);) |
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Hein
Registered: Apr 2004
Posts: 954 |
It's still a bit odd to see a MacGyver in the Cracker charts, though he is a pr manager (with 1.7 as vote).. |
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Jazzcat
Registered: Feb 2002
Posts: 1044 |
I guess the charts on CSDB can only be taken as serious as those who lodged the votes to begin with. ;)
Charts these days are a laugh, a real shame some old-style scene chart/website is not compiled/created. It may stir some competition or provoke some motivation. |
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Nightlord
Account closed
Registered: Jan 2003
Posts: 131 |
there needs to be a present chart like it is supposed to be on diskmags. a chart where someone who has not released anything for a certain time should be left out of.
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Celtic
Administrator
Registered: Jan 2002
Posts: 807 |
i think instead of 5 votes a production, person or group should get 10 votes to be entered in the charts. there are enough users nowadays, and someone with only 5 votes usually ends up at a place where they dont belong. |
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Perff
Administrator
Posts: 1679 |
Quote: i think instead of 5 votes a production, person or group should get 10 votes to be entered in the charts. there are enough users nowadays, and someone with only 5 votes usually ends up at a place where they dont belong.
I though about something similar. This would make the charts a bit more realistic, but on the other hand a lot of entries will be removed from the charts. (The ones with 5-9 votes)
Anyone against the idea? |
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