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FICO takes some heat for the subprime mess

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Shares of Moody's (NYSE: MCO) have plunged as the ratings agencies become Public Enemy No. 1 in the quest for a villain in the subprime fiasco.

Now Forbes is wondering (subscription required) about Fair Isaac (NYSE: FIC), a rating agency for individuals that uses a complex algorithm to calculate a FICO score. As evidenced by the rising foreclosure rates on loans that were given based on people's FICO scores, it seems that the algorithm may not have had as much predictive power as they thought.

According to Forbes, "In January a contrite Fair Isaac, along with bond rating agency DBRS (formerly Dominion Bond Rating Service), produced a study that revealed some of FICO's limitations. It found, for instance, that a borrower with a high credit score is just as likely to default on a no-money-down mortgage as a lower-scoring borrower who puts down 40%. So two portfolios with identical average FICOs can behave very differently."

In other words, the average FICO score of a portfolio of loans is not an accurate predictor of risk -- a huge problem because that's exactly what many investors assumed it was.

Now Fair Isaac seems to be backing off the value of its ratings: According to a vice president at the company, "FICO scores an individual's risk over time. It's not an assessment of the riskiness of the loan made."

If a FICO score can't be used to asses the riskiness of a loan, what good is it in determining whether to lend to someone?

In the wake of the blow-ups of numerous quant funds and scandals involving rating agencies with complex algorithms, it looks like investors would do well to step away from the computer and do some old-fashioned hands-on due diligence.

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Last updated: November 26, 2009: 09:48 AM

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