Prepayment speeds were projected to increase 10%-15% on average in response to a higher number of collection days at 22 from 20; a pickup in refinancing activity in response to record low mortgage rates, and a rush by servicers to close conventional loans before a 10-basis-point increase in the guaranty fee went into effect on April 1.

It appears, however, that most of the latter effect occurred in February, which recorded a faster-than-expected increase in speeds.

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