Weighted Average Maturity - WAM
The measure is calculated by totaling each mortgage value represented by the MBS. The weights of each mortgage is found by dividing the value of each into the total of all. To arrive at the WAM number the weight of each security is multiplied by the time until maturity of each mortgage, and then all the values are added together. For example say an MBS has three mortgages valued at $1,000, $2,000 and $3,000 (a total of $6,000) and mature in one, two and three years respectively. The weights of these are 1/6 (1,000/6,000), 1/3 (2,000/6,000) and 1/2 (3,000/6,000). The WAM is 2 1/3 years (1/6 x 1 year + 1/3 x 2 years + 1/2 x 3 years).
Investment dictionary. Academic. 2012.
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