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An odds ratio (OR) is a statistic that quantifies the strength of the association between two events, A and B. The odds ratio is defined as the ratio of the odds of event A taking place in the presence of B, and the odds of A in the absence of B. Due to symmetry, odds ratio reciprocally calculates the ratio of the odds of B occurring in the presence of A, and the odds of B in the absence of A.
However, the music album's distributor can set a higher price for the album (as long as it is some amount of dollars and 99 cents), which usually happens on popular music albums. For special offers, prices of music albums can be dropped to $4.99 , $5.99 , $6.99 , or $7.99 .