Just when yields on mortgage-backed securities are shrinking to unpalatable levels, one of the premier prepayment forecasters has left Bear, Stearns & Co. to focus on expanding his aresenal of analytical tools.

Chuck Ramsey, a senior managing editor at Bear Stearns, officially joined Houston-based MMAR Group Inc. earlier this month. Mr. Ramsey founded "specified pool analytics," a method of distinguishing prepayment rates according to geographical and other data. He was also a full-time trader with Bear Stearns for over eight years.

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