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Epignosis View Drop Down
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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
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Mr ProgFreak View Drop Down
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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.
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Dean View Drop Down
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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?
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Epignosis View Drop Down
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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
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Epignosis View Drop Down
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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
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M@X View Drop Down
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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 !
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Dean View Drop Down
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Points: 37575 		Direct Link To This Post Posted: May 14 2009 at 10:23
 oops! I forgot that bit about the averages/genre. Embarrassed
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debrewguy View Drop Down
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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.
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Epignosis View Drop Down
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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
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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 !!!
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M@X View Drop Down
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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 !
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Epignosis View Drop Down
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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
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MovingPictures07 View Drop Down
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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!
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M@X View Drop Down
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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 !
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