31.   Our estimates are based on case studies, actual experiences.

32.   Pugh said his estimate was based on the assumption that American will only replace pilots who retire during that period.

33.   Republican lawmakers assured Greenspan, Volcker and other experts that they will offset tax cuts with spending cuts, and their estimates will be based on cautious economic assumptions.

34.   She based the estimate on a weeklong evaluation by users who rated the organization and clarity of the summaries.

35.   Since officials have no way to keep track of exactly how many new infections arise each year, the number is an estimate based on findings from several studies.

36.   That estimate was based on data through October.

37.   That estimate was based on requests for repairs, and Mertens said Perfection was re-evaluating how many might fail.

38.   The CBO estimates are based on a number of reasonable assumptions about economic growth, inflation, interest rates, world conditions, and so on.

39.   The company said earlier estimates were based on falsified samples.

40.   The estimate is based on the average of seven analysts polled by IBES International Inc.