51.   The estimate was based on four analysts surveyed by Zacks.

52.   The estimates are based on an understanding of nuclear physics and the rate at which hydrogen converts to helium in stars.

53.   The estimates were based on current spending and revenue projections.

54.   The ICI based its estimate on statistics for money invested directly in stocks and investments in stock mutual funds.

55.   The ICI based its estimate on statistics for money invested indirectly in stocks and investments in stock mutual funds.

56.   The group based the estimate on its inspection of Kansas winter wheat from Colby to Wichita, areas hard hit by the freeze.

57.   The informal estimate is based on a computer-generated program used by Boston-based Applied Insurance Research Inc. to calculate insured losses from catastrophes.

58.   The lower price estimate is based on new projections that show larger U.S. gas reserves than previously thought.

59.   The report based its estimates on the number of casinos permitted under the resolution.

60.   The Treasury bases its estimates on a measure called family economic income, first put forward in the Reagan administration.