TOP 100 Progressive Music Albums

Mike thanks for your explanation on the 23th of kuly.
But I still don't get it!

I see how you compute "the average" but for whom ??

With your example with two albums:

================

N=10
R=3.80

now we have an album which has only one rating of 5.0:

n=1
r=5.00

The weighted average is:

avg = (N*R + n*r) / (N+n)

In this case:

avg = (10*3.80 + 1*5) / (10+1) = 43/11 = 3.91

====================

That's nice, but what average? It's the overall average for all albums.
But who would be ranked higher in this case? album (N,R) or (n,r) ?
And why ? (Formula, please :} )

I hate to tell you I have a PhD in Mathematics but it still doesn't make sense to me.

Possible Ratings algorithm error ???

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