Optifi Inc., a company formed last year by Fair, Isaac & Co. and the technology firm MarketSwitch, plans to bring a mortgage scoring product to market by yearend that can predict the likelihood that a loan will prepay before its stated maturity, much as Fair, Isaac's credit scores predict the probability of a borrower's defaulting on a loan.

Executives say the Edina, Minn., company's patented product, also to be called Optifi, will directly challenge the prepayment models that Wall Street, individual mortgage companies, and private technology companies use to price mortgage-backed securities and mortgage servicing for lenders and investors.

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