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Wednesday, June 10, 2009

Index

Index
The 12-month moving average of the one-year constant maturity treasury (CMT) used as an index for adjustable rate mortgages. The index is calculated by adding the 12 most recent monthly CMT values and dividing by 12. Since the MTA index is a moving average it has a lag effect. In other words, when the 12 monthly CMT values used to calculate the average are sequentially increasing, the current MTA value will not be as high as the current CMT value, and visa versa when the CMT values are sequentially falling.

 

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