Query bug (?)
Printed From: Progarchives.com
Category: Site News, Newbies, Help and Improvements
Forum Name: Report bugs here
Forum Description: Help us improve the site from a tech standpoint
URL: http://www.progarchives.com/forum/forum_posts.asp?TID=74305
Printed Date: January 05 2025 at 19:39
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com
Topic: Query bug (?)
Posted By: someone_else
Subject: Query bug (?)
Date Posted: December 21 2010 at 13:39
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When I click on the link http://www.progarchives.com/top-prog-albums.asp?salbumtypes=1#list" rel="nofollow - PA Top Prog Albums , there appear 100 studio albums, of which Pain of Salvation's Be is the last with a weighted rating (WR) of 4.0821.
When I modify the restrictions by selecting the years from 1989 to 2010, this album appears at #40 with a WR of 4.1163.
Here are the results of the numbers 91 to 100 in the PA Top Prog Albums list and their rankings in the list with the year restrictions.
Top 100 WR Modified WR Artist Title
91 4.1031 19 4.1885 Death Symbolic
93 4.0947 7 4.2508 Cardiacs Sing to God
94 4.0942 24 4.1616 Arena Contagion
97 4.0907 18 4.1892 Birds and Buidings Bantam to Behemoth
100 4.0821 40 4.1163 Pain of Salvation Be
To exclude the possibility of an inbetween re-calculation, I requeried after some 15 minutes.
Is the PA Top Prog Albums list a snapshot view from an earlier situation, or is there more than one formula used to calculate the weighted ratings?
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Replies:
Posted By: Angelo
Date Posted: December 21 2010 at 13:49
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Forwarded to M@X. Thanks for reporting, Dutchman!
------------- http://www.iskcrocks.com" rel="nofollow - ISKC Rock Radio I stopped blogging and reviewing - so won't be handling requests. Promo's for ariplay can be sent to [email protected] |
Posted By: Epignosis
Date Posted: December 21 2010 at 14:03
It's the Walter bug! 
I may be wrong, but I'm pretty sure the weighted rating changes depending on what albums are included in the chart. The weighted rating reflects the album's rating in comparison to the number of ratings it has, as well as the ratings and number of ratings of the albums it is being compared to. So quite right it will be different when you change the Top Album parameters. ------------- https://epignosis.bandcamp.com/album/a-month-of-sundays" rel="nofollow - https://epignosis.bandcamp.com/album/a-month-of-sundays |
someone_else wrote:Posted By: someone_else
Date Posted: December 21 2010 at 16:18
I see that the WR changes with varying query restrictions. Yet it seems to me that a random element is introduced when the ordering sequence between albums that participate in different query results varies depending on the restrictions, making the ranking order somewhat unreliable.
Note: I am not familiar with the principles of weighted ratings. Maybe I have to study a bit on it. -------------
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Posted By: M@X
Date Posted: December 22 2010 at 06:34
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Hi all,
Thanks for reporting this. I improved the informations to explain how we proceed to calculate the list. It is not a bug, the Query Weighted Rating is calculated every query. So the QWR is recalculated every request. This is why the QWR of PAIN OF SALVATION changes every query (if query parameters are modified: years, genres, ...) . Hope it's clear ? Please check the updated text info http://www.progarchives.com/top-prog-albums.asp?salbumtypes=1#list" rel="nofollow - http://www.progarchives.com/top-prog-albums.asp?salbumtypes=1#list and tell me if it's clearer. ------------- Prog On ! |
Posted By: someone_else
Date Posted: December 22 2010 at 08:17
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^Thanks for the info, mailto:M@X" rel="nofollow - M@X . I think it is clear. I'll study the matter of QWR calculation when I have some more time for this. Maybe I give some comments or suggestions afterwards in the "Help us to improve the site"-section.
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Posted By: harmonium.ro
Date Posted: December 27 2010 at 09:07
I went to the 2010 Chart and Enslaved's album had a 3.98 rating from 48 ratings. I rated it a **** and the information updated to show 4.02 from... 47 ratings.  How's that possible?
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Posted By: M@X
Date Posted: December 28 2010 at 09:29
 well, if you update your rating with the Quick Rating feature, how does it react ?------------- Prog On ! |
Posted By: harmonium.ro
Date Posted: December 28 2010 at 09:42
| Changing that rating doesn't seem to provoke any error. I rated two other albums right now and it went fine. Maybe I just had a halucination... I'll keep you posted if the issue reappears. |