Some Mortgage Rates Edge Up: Thirty-year fixed-rate mortgages averaged 8.03% this week, up from 8.01% last week, according to a national survey by the Federal Home Loan Mortgage Corp. It was the highest since May 16, when rates averaged 8.08%. Rates had fallen to 6.94% in February before they started rising. They now have been above 8% for four straight weeks. On one-year adjustable-rate mortgages, lenders were asking an average initial rate of 5.76%, up from 5.75% last week. Fifteen-year mortgages averaged 7.54% this week, up from 7.51% a week earlier. The rates do not include add-on fees known as points.