30-year fixed rate at 5.52%; 10-year Treasury yield at 3.79%

Long-term mortgage interest rates headed lower Friday, and the benchmark 10-year Treasury bond yield dropped to 3.79 percent.

The 30-year fixed-rate average sank to 5.52 percent, and the 15-year fixed rate slipped to 5.03 percent. The 1-year adjustable rate was down at 5.34 percent.

The 30-year Treasury bond yield fell to 4.38 percent.

Rates and bonds are current as of 7:15 p.m. Eastern Standard Time.

Mortgage rate figures are according to Bankrate.com, which publishes nightly averages based on its survey of 4,000 banks in 50 states. Points on these mortgages range from zero to 3.5.

In other economic news, the Dow Jones Industrial Average tumbled 246.79 points, or 1.92 percent, finishing at 12,606.3. The Nasdaq lost 48.58 points, or 1.95 percent, closing at 2,439.94.

Stock figures are current as of 7:30 p.m. Eastern Standard Time.

The credit scoring system is being tweaked again as Fair Isaac Corporation, developer of the FICO credit score rolls out a new model dubbed FICO 08.

The new product was originally announced back in June but was not due to be finalized for a while. A demand by users in the wake of both rising mortgage defaults and consumer credit delinquencies for a better way of analyzing risk has pushed FICO into speeding up the release. It is expected that FICO 08 will begin to roll out by late spring.

Last year the three major credit bureaus announced credit score packages of their own, probably having seen the success FICO was having in charging consumers for information on their credit scores. FICO, however, remains the product used by most lenders not only to grant credit but to set interest rates and other loan terms. FICO scores are also factored into credit decisions by insurance underwriters, cell phone, and utility companies and are sometimes used by employers to evaluate prospective employees.

FICO predicts that the new scoring system will help lenders reduce default rates on consumer loans between 5 and 15 percent. FICO 08 will supposedly go easier on consumers who make the occasional slip while coming down harder on those with multiple offenses. For example, it will give a slightly higher score than previously to a borrower who is late on one obligation but current on multiple other accounts. Those with several delinquent accounts could find their credit score has dropped.

Scores will still range from 300 to 850 and will take into account the same factors as the old version such as timely payment history, length of credit history, amount of debt, ratio of debt to available credit, type of debt (credit cards good, finance companies not so good), and any excessive amount of recent new credit. There will also be a premium placed on the debt mix; that is a consumer with revolving and installment credit will fare better than one with nothing but (revolving) credit card debt.

Among the big changes FICO is in the area of evaluating "authorized users." An authorized user is one who is not responsible for paying a credit card, but that card's history is reported on the user's credit as well as on the owner's credit. Parents have for years made children authorized users of their cards in order to help them build credit and many spouses derive all of their credit histories from being authorized users of their husband's or wife's card.

This form of credit improvement, commonly called "piggy-backing," however, became an article of commerce. As we reported in June, a whole industry had grown up to broker improved credit through authorized user status. Credit card owners with healthy FICO scores could make significant income by renting authorized user status to those seeking to improve their scores. The broker would manage the rental transaction (in which the renter would never have access to the actual account) paying the owner a fee of perhaps $150. Since the transaction has an almost immediate effect on the renters score the broker can fairly quickly remove that name from the account and recycle it to another renter, generating another $150 for the owner. The new credit information remains on the first renter's credit report forever.

Lenders became alarmed about this practice as it seemed to undermine their attempts to contain risk so FICO 08 will eliminate any impact of being an authorized user. This will not only affect the authorized user for a fee but also the college student hoping to build his credit on the foundation of his parents'.

A number of websites have sprung up in an effort to prevent FICO from implementing FICO 08 but most of the complaints are those that have long been leveled against credit scoring and credit reporting agencies. Critics have long questioned whether scores are valid measures of risk, complained about a lack of transparency about how scores are calculated, and postulated that minorities are unfairly penalized by the systems. The new version of FICO has prompted anger over the elimination of the authorized user category claiming that it will unduly penalize women who are more likely to have that status on their husbands' card than vice versa.

One website recommends that authorized users of spouses accounts open a few new ones either jointly with the spouse or in their own names and advises persons who are about to be married to retain their own credit cards even as they are added as an authorized user to the spouses credit lines.

The headlines read "Chairman Bernanke Says Fed Ready to Cut Interest Rates as Needed." Well, not exactly. What Federal Reserve Chairman Ben Bernanke actually said, in remarks on Thursday was "We stand ready to take substantive additional action as needed to support growth and to provide adequate insurance against downside risks."

Bernanke made his remarks in a speech to a housing and economic forum in Washington, DC. He reviewed the history of the housing slowdown and the credit crunch and the various recent moves on the part of the Federal Reserve to shore up the economy including lowering its principal rate three times last year to a two year low of 4.25 percent and introducing a term auction facility or TAF through which specified amounts of discount window credit can be auctioned to eligible borrowers, successfully auctioning $40 billion to banks in December.

In spite of the fact that the Chairman did not mention numbers in his statement about the Fed's readiness, many economists expect that the Fed will slash its key interest rate by a half-point at its next meeting at the end of the month. Others think that many members of the Fed board are more worried about inflation than a recession given $100 per barrel oil and the Feds will limit any cut to one-quarter point.