After two months of gradual sliding, the share price of Fair, Isaac & Co. took a nosedive last week on a warning about this quarter's earnings.

The San Rafael, Calif.-based company, which sells credit scoring and risk management software, said Wednesday it does not expect to meet fiscal first-quarter earnings expectations of 41 to 45 cents per share. Instead it envisions per-share earnings close to last year's 33 cents.

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