The goodwill impairment charge, or lowered book value of an asset, arose after the Advanced Micro Devices conducted an analysis of the businesses and determined that they weren't performing to its expectations, making it the second ATI-related write-down that the chipmaker has had to stomach since buying the company in July 2006.

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The algorithm could be of great interest to Twitter, which could charge a premium for ads linked to popular topics, but it also represents a new approach to statistical analysis that could, in theory, apply to any quantity that varies over time: the duration of a bus ride, ticket sales for films, maybe even stock prices.

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