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GuyM 
Forum Senior Member 
Joined: December 29 2004 Location: United Kingdom Status: Offline Points: 192 |
 Topic: Rating Avg. scoresPosted: April 25 2012 at 14:47 |
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Why do these change?
Does the site recalculate them average every time it refreshes For my latest album "Margaret's Children" it has had 51 reviews and it was 4.06 avg. 2 days ago...4.01 avg. this morning and now its 3.99 but nothing appears to have changed? Curious Guy
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Snow Dog
Special Collaborator 
Honorary Collaborator Joined: March 23 2005 Location: Caerdydd Status: Offline Points: 32995 |
Posted: April 25 2012 at 14:50 |
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^Were there no ratings without reviews added?
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Logan
Forum & Site Admin Group
Site Admin Joined: April 05 2006 Location: Vancouver, BC Status: Offline Points: 35804 |
Posted: April 25 2012 at 15:01 |
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The last review was made by Atomic Crimson Rush, and he made it on April 20th. Unless a review was added to a rating only, which would have changed things. Does indeed have 51 reviews/ ratings. Perhaps someone, or more than one cause it changed twice, altered his/her rating, or there has been some algorithm tweaking.
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rushfan4
Special Collaborator
Honorary Collaborator Joined: May 22 2007 Location: Michigan, U.S. Status: Offline Points: 66262 |
Posted: April 25 2012 at 15:16 |
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I am pretty sure that I read once that there is some overall algorithm involving all reviews of all albums on PA that comes into the calculation, so even though there have been no new reviews of that particular album, the reviews of other albums has caused the rating to change.
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Logan
Forum & Site Admin Group
Site Admin Joined: April 05 2006 Location: Vancouver, BC Status: Offline Points: 35804 |
Posted: April 25 2012 at 15:46 |
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I seem to remember that too, actually, and had thought about mentioning it, but then promptly forgot. That sounds like the probable cause.
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Dean
Special Collaborator
Retired Admin and Amateur Layabout Joined: May 13 2007 Location: Europe Status: Offline Points: 37575 |
Posted: April 25 2012 at 16:43 |
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No, the rating value is purely arithmetic based upon the reviews and ratings the album receives and nothing more.
The chart position uses an algorithm that involves site averages, which is shown as the QWR value in the charts (which is 3.8771 for Margaret's Children).
I've manually copied all the ratings for this album into Excel and done the calculation myself: the value of 3.99 for 51 ratings (inc 2 collab reviews and 2 non-collan reviews) is correct.
I can only assume you are mistaken about the total number of ratings of the album not changing when you saw the average change because the only way the average can change is if there are more (or less) ratings. The last rating of this album is dated 4/21/2012 7:06:09 AM EST, which was obviously 4 days ago, and since that was a 4-star rating it would not have decreased the average.
I deleted the ratings of a member who had two accounts yesterday, but he had not rated this album and since was an Astra fanboy he would have given it 1-star anyway which would have resulted in the average going up after I deleted him, not down.
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What?
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Epignosis
Special Collaborator
Honorary Collaborator Joined: December 30 2007 Location: Raeford, NC Status: Offline Points: 32524 |
Posted: April 25 2012 at 16:54 |
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Having seen this from my own albums, it usually means a person who already rated the album has changed their rating.
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Dean
Special Collaborator
Retired Admin and Amateur Layabout Joined: May 13 2007 Location: Europe Status: Offline Points: 37575 |
Posted: April 25 2012 at 16:55 |
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^ that makes sense
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What?
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TheGazzardian
Prog Reviewer 
Joined: August 11 2009 Location: Canada Status: Offline Points: 8676 |
Posted: April 25 2012 at 16:55 |
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I can think of two things that may have happened: 1. A user was promoted to Collab rank / demoted from Collab rank, changing their weighting; or 2. Someone went back and changed the value of their rating/review
Edited by TheGazzardian - April 25 2012 at 16:56 |
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Dean
Special Collaborator
Retired Admin and Amateur Layabout Joined: May 13 2007 Location: Europe Status: Offline Points: 37575 |
Posted: April 25 2012 at 17:10 |
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^ it's not (1)
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What?
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Epignosis
Special Collaborator
Honorary Collaborator Joined: December 30 2007 Location: Raeford, NC Status: Offline Points: 32524 |
Posted: April 25 2012 at 22:18 |
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Not sure if this makes any difference, but two Jethro Tull albums (APP & TMitG) were knocked off the top 20 within 48 hours without new reviews or ratings. They took quite a tumble too (0.04 and 0.05 points respectively, which is considerable considering the number of ratings). The last rating for either album was 5 stars, too, and both of those were from a visitor who last visited on the last day of March.
I have a hard time believing a number of people suddenly decided these two albums were bad and so downgraded their ratings. |
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Epignosis
Special Collaborator
Honorary Collaborator Joined: December 30 2007 Location: Raeford, NC Status: Offline Points: 32524 |
Posted: April 25 2012 at 22:20 |
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And, funny enough, I get a 500 error when I try to visit the album that took on of their places:
http://www.progarchives.com/album.asp?id=15201 |
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Dean
Special Collaborator
Retired Admin and Amateur Layabout Joined: May 13 2007 Location: Europe Status: Offline Points: 37575 |
Posted: April 26 2012 at 01:44 |
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^ That's odd - where did that link come from Rob? I cannot find it in the chart.
The album ID of 15201 is for Steve Unruh's The Great Divide - that album and its ratings are accessible from the Admin page and I can't see anyhting wrong with either of them, the last rating is dated 28/3/2012.
The last ratings for APP and TMitG were 24/4/2012, and "he" awarded 5-stars to both. And the last person to rate The Great Divide also rated APP and TMitG on the 28th of March.
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Windhawk
Special Collaborator
Honorary Collaborator Joined: December 28 2006 Location: Norway Status: Offline Points: 11401 |
Posted: April 26 2012 at 05:38 |
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Indeed. That page, alongside numerous others, will not display. All the data is there when looking through the admin panel. But try loading the page in a browser and bam " 500 - Internal server error.There is a problem with the resource you are looking for, and it cannot be displayed." |
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Websites I work with:
http://www.progressor.net http://www.houseofprog.com My profile on Mixcloud: https://www.mixcloud.com/haukevind/ |
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Dean
Special Collaborator
Retired Admin and Amateur Layabout Joined: May 13 2007 Location: Europe Status: Offline Points: 37575 |
Posted: April 26 2012 at 08:17 |
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^ fixed.
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What?
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Snow Dog
Special Collaborator
Honorary Collaborator Joined: March 23 2005 Location: Caerdydd Status: Offline Points: 32995 |
Posted: April 26 2012 at 08:25 |
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^Not quite. It is back. When I tried to listen to a stream.
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GuyM
Forum Senior Member
Joined: December 29 2004 Location: United Kingdom Status: Offline Points: 192 |
Posted: April 27 2012 at 03:42 |
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Thanks, that all makes sense
Guy
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Rating Avg. scores
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rushfan4 wrote: