The average rate on a 30-year U.S. mortgage ticked up this week, ending a four-week slide that brought down borrowing costs for homebuyers to the lowest level in nearly a year.

The rate rose to 6.3% from 6.26% last week, mortgage buyer Freddie Mac said Thursday. A year ago, the rate averaged 6.08%.

Borrowing costs on 15-year fixed-rate mortgages, popular with homeowners refinancing their home loans, also edged higher. The average rate rose to 5.49% from 5.41% last week. A year ago, it was 5.16%, Freddie Mac said.

Mortgage rates are influenced by several factors , from the Federal Reserve’s interest rate policy decisions to bond market investors’ expectations for the economy and inflation. They generally follow the trajectory of the 10-year Treasury yield, which lenders use as a guide to

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