Forum Home Forum Home > Site News, Newbies, Help and Improvements > Report bugs here
  New Posts New Posts RSS Feed - Charts Do Not Match
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Topic ClosedCharts Do Not Match
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
Epignosis View Drop Down
Special Collaborator
Special Collaborator
Avatar
Honorary Collaborator

Joined: December 30 2007
Location: Raeford, NC
Status: Offline
Points: 32580 		Direct Link To This Post Topic: Charts Do Not Match
    Posted: May 14 2009 at 09:16
This may already be known, and I just missed it, but it seems the top 20s on the genre pages do not match the top albums list when sorted by genre.

For instance, on the top 20 in prog folk, the #20 album is Jethro Tull's Benefit, while on the larger list, the #20 spot is occupied by Cei Ce Ne-Au Dat Nume by Phoenix.

Is there a reason for this discrepancy, or is it a bug?
https://epignosis.bandcamp.com/album/a-month-of-sundays
Back to Top
Mr ProgFreak View Drop Down
Forum Senior Member
Forum Senior Member
Avatar

Joined: November 08 2008
Location: Sweden
Status: Offline
Points: 5195 		Direct Link To This Post Posted: May 14 2009 at 09:28
^ the larger list has more options, for example minimum number of ratings ... I guess those parameters are different for the top 20 lists.
Back to Top
Dean View Drop Down
Special Collaborator
Special Collaborator
Avatar
Retired Admin and Amateur Layabout

Joined: May 13 2007
Location: Europe
Status: Offline
Points: 37575 		Direct Link To This Post Posted: May 14 2009 at 09:31
Yes, there is a reason - the genre page does not set a minimum number of ratings when compiling the chart, the larger list excludes all albums with less than 25 ratings.
What?
Back to Top
Epignosis View Drop Down
Special Collaborator
Special Collaborator
Avatar
Honorary Collaborator

Joined: December 30 2007
Location: Raeford, NC
Status: Offline
Points: 32580 		Direct Link To This Post Posted: May 14 2009 at 09:34
Originally posted by Dean Dean wrote:

Yes, there is a reason - the genre page does not set a minimum number of ratings when compiling the chart, the larger list excludes all albums with less than 25 ratings.


After I posted, I started playing with those parameters, but still couldn't figure out how to get the big chart to match the top 20.  Thanks for the info gents.
https://epignosis.bandcamp.com/album/a-month-of-sundays
Back to Top
Epignosis View Drop Down
Special Collaborator
Special Collaborator
Avatar
Honorary Collaborator

Joined: December 30 2007
Location: Raeford, NC
Status: Offline
Points: 32580 		Direct Link To This Post Posted: May 14 2009 at 09:41
I took off the filter in the big chart, and the charts are closer to matching, but still do not.

Not trying to be a pest, just reporting.  Wink
https://epignosis.bandcamp.com/album/a-month-of-sundays
Back to Top
M@X View Drop Down
Forum & Site Admin Group
Forum & Site Admin Group
Avatar
Co-founder, Admin & Webmaster

Joined: January 29 2004
Location: Canada
Status: Offline
Points: 4077 		Direct Link To This Post Posted: May 14 2009 at 10:21
Let me add some info and so we can understand and maybe improve things...

Mr. ProgFreak and Dean were right with the number of ratings, in the sub-genre page the minimum is dynamically set using the average number of ratings of studio album of that sub-genre , in comparaison to the TOP PROG ALBUM tool wich is set manually.

Also, in the sub-genre pages, the position in the TOP 20 is calculated using the same algorithm but  comparing and weighting the album avg rating to only the studio album of that sub-genre, in comparaison of the TOP PROG ALBUM tool wich is comparing them all-together.

What do you think ?

Does it explain well ?

Please share

Max
Prog On !
Back to Top
Dean View Drop Down
Special Collaborator
Special Collaborator
Avatar
Retired Admin and Amateur Layabout

Joined: May 13 2007
Location: Europe
Status: Offline
Points: 37575 		Direct Link To This Post Posted: May 14 2009 at 10:23
 oops! I forgot that bit about the averages/genre. Embarrassed
What?
Back to Top
debrewguy View Drop Down
Special Collaborator
Special Collaborator
Avatar
Honorary Collaborator

Joined: April 30 2007
Location: Canada
Status: Offline
Points: 3596 		Direct Link To This Post Posted: May 14 2009 at 12:09
It's just a way to a make more people happy about seeing a favourite band on a top 20 list Cool
"Here I am talking to some of the smartest people in the world and I didn't even notice,” Lieutenant Columbo, episode The Bye-Bye Sky-High I.Q. Murder Case.
Back to Top
Epignosis View Drop Down
Special Collaborator
Special Collaborator
Avatar
Honorary Collaborator

Joined: December 30 2007
Location: Raeford, NC
Status: Offline
Points: 32580 		Direct Link To This Post Posted: May 14 2009 at 12:19
It's just that if I see a list of the top 20, but then I want to find out which album is #21, I can't find that out because there are two different criteria used to produce those two lists.

Or am I being obtuse?  Is there way to set the filters such that it matches the top 20 on the genre page, or no because the big list uses ratings from all genres (even when a genre filter is added)?
https://epignosis.bandcamp.com/album/a-month-of-sundays
Back to Top
M@X View Drop Down
Forum & Site Admin Group
Forum & Site Admin Group
Avatar
Co-founder, Admin & Webmaster

Joined: January 29 2004
Location: Canada
Status: Offline
Points: 4077 		Direct Link To This Post Posted: May 14 2009 at 12:32
Yes, there is a way , I will check it out Epignosis !!!
Prog On !
Back to Top
M@X View Drop Down
Forum & Site Admin Group
Forum & Site Admin Group
Avatar
Co-founder, Admin & Webmaster

Joined: January 29 2004
Location: Canada
Status: Offline
Points: 4077 		Direct Link To This Post Posted: May 14 2009 at 14:14
TOP 100 , done !

you can now select to view the genre TOP 100 in the sub-genre page.

For now there is still a difference between the GENRE RESUTS and the TOP PROG tool results.

I will work on this ...
Prog On !
Back to Top
Epignosis View Drop Down
Special Collaborator
Special Collaborator
Avatar
Honorary Collaborator

Joined: December 30 2007
Location: Raeford, NC
Status: Offline
Points: 32580 		Direct Link To This Post Posted: May 14 2009 at 15:00
Originally posted by M@X M@X wrote:

TOP 100 , done !

you can now select to view the genre TOP 100 in the sub-genre page.

For now there is still a difference between the GENRE RESUTS and the TOP PROG tool results.

I will work on this ...




In case anyone hasn't told you lately, you're amazing. Thumbs Up
https://epignosis.bandcamp.com/album/a-month-of-sundays
Back to Top
MovingPictures07 View Drop Down
Prog Reviewer
Prog Reviewer
Avatar

Joined: January 09 2008
Location: Beasty Heart
Status: Offline
Points: 32181 		Direct Link To This Post Posted: May 14 2009 at 15:23
Originally posted by Epignosis Epignosis wrote:

Originally posted by M@X M@X wrote:

TOP 100 , done !

you can now select to view the genre TOP 100 in the sub-genre page.

For now there is still a difference between the GENRE RESUTS and the TOP PROG tool results.

I will work on this ...




In case anyone hasn't told you lately, you're amazing. Thumbs Up


Seconded.

I love the new top 100 feature. It's awesome!
Back to Top
M@X View Drop Down
Forum & Site Admin Group
Forum & Site Admin Group
Avatar
Co-founder, Admin & Webmaster

Joined: January 29 2004
Location: Canada
Status: Offline
Points: 4077 		Direct Link To This Post Posted: May 15 2009 at 02:10
Many changes during the past days to the TOP PROG ALBUM tool and the sub-genre list of key albums.

Basically , the algorithm is mostly the same, it's the default value use in the calculation that have changed.

Here the updated info describing the calculations variables and filters in the TOP PROG ALBUM tool:

Here is some details about how we calculate the average rating of an album and the rank of an album.

  • Average rating: The classic calculation of the average but more weight is affected to the rating of progarchives.com collaborators and to rating with reviews.
    - Rating only: Weight = 1
    - Review by members : Weight = 5
    - Review by PA Collaborators : Weight = 10
  • Rank of an album: We use a calculation that compare an album average rating and number of ratings over all others albums in the query using this theory (http://en.wikipedia.org/wiki/Weighted_average)

  • By default, only albums with at the number of ratings above the average number of ratings in the query and only albums with at the average ratings above the average ratings in the query are displayed in theses lists



The results have changed in both the PA TOP 100 PROG  albums and in the sub-genre too because of the changes in the default variables.

Please post your sugg. and comments here.
Prog On !
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.184 seconds.
Donate monthly and keep PA fast-loading and ad-free forever.