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Nielsen Finds Errors in U.S. Network TV Ratings Data

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Nielsen NV, the television research firm being challenged by Rentrak Corp., said it discovered errors in national network ratings and will reissue results for the new TV season.

An internal investigation found problems going back to March 2, Nielsen said yesterday in a statement. The company will revise results going back to Aug. 18, and has asked Ernst & Young LLP and the industry-backed Media Rating Council to join the probe. Cable and local TV ratings weren’t affected.