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					Originally posted by Chemical X.  Has iTunes always had weighted charts? They aren't based on pure sales???   | 
	
 iTunes charts are based on pure sales but they don't use simple formula like "sales from last 1 hour" ect.
It works in this way:
Sales from last 1 hour + sales from last 6 hours * 0.5 + sales from last 24 hours * 0.25 + sales from last 7 days * 0.1 
Of course I don't know how weights look but it's not simple like 'sales from last x' for sure