The Cost of Funds Index for savings institutions in the  11th Federal Home Loan Bank district is expected to rise to 4.892% for   August, from 4.887% in July, according to traders at eight firms surveyed   by   Bloomberg News.       
Their estimates ranged from 4.872% to 4.912%.
  
The Cost of Funds Index measures the interest paid by thrifts in the  district on deposits, advances from the Federal Home Loan Bank, and more   costly purchases of short-term funds. It is also used as a base rate for   West Coast mortgages and for bonds backed by those loans.     
A rise in the index, called Cofi, diminishes disposable cash of  homeowners with adjustable-rate mortgages by increasing their monthly   mortgage payments. For bondholders, a rise in the index increases the   coupon rate on their adjustable-rate mortgage securities.     
  
The San Francisco Home Loan Bank releases the index at 3 p.m. Pacific  time on the last business day of every month. The August index will be in   effect through October.