Data Problems for Nielsen in 12 Markets

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Nielsen Media Research is withholding New Year’s Eve local-ratings data for 12 markets in the West “due to an unusual set of hardware failures,” the ratings company told its clients Tuesday.

Nielsen issued a missive to its customers regarding Dec. 31 numbers for San Diego; Los Angeles; Los Angeles Hispanic; Denver; Sacramento, Calif.; Salt Lake City; San Francisco; Phoenix; Seattle; Las Vegas; Albuquerque, N.M.; and Portland, Ore.

“The hardware failures caused a disruption to the calling-in process from Nielsen’s sample households in these 12 markets,” Nielsen said in its memo to its subscribers. “We are also working to see if data from these 12 markets can be recovered and reprocessed.”

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