The F.H.F.A. cannot rely on estimates from the credit ratings agencies about the extent of those losses, Ms. Tavakoli said.
The first is to tally the money made from scams, based on estimates from officials and investigators.
The new unemployment figures are based on estimates from the New York State Department of Labor, which tried to forecast how much federal aid the city might need.
Administration officials also point out that the monthly jobs data is notoriously jumpy, based on estimates from two often-conflicting surveys.
The savings from the Barnett formula are based on estimates from the TaxPayers Alliancee, a body that lobbies for lower taxes.
Based on estimates from the White House Office of National Drug Control Policy, Americans spend at least $64 billion a year on illegal drugs.
There's another way to gauge some of Green Mountain's capital expenditures that doesn't rely on estimates from Mr. Einhorn, whose fund is likely betting against the company's shares.
Based on estimates from the Congressional Budget Office, the Senate bill would increase the gross domestic product by 3.3 percent by 2023 and by 5.4 percent by 2033.
Forty-one defensive linemen died of heart disease, compared with the expected 29 deaths based on estimates from the general population.
Regulators were relying on estimates from the firm and the CME Group, the exchange where MF Global did most of its business.
The seat predictions based on the Ipsos MORI poll are based on estimates from the Electoral Calculus website which looks at uniform national swing across seats.
