Abstract
The earliest preliminary or provisional estimates of sixteen items in the national accounts of the United States have been compared with the most thoroughly revised estimates currently available for the period, 1947 II-1955 IV. For corresponding revised and provisional estimates, average absolute differences in level and in amount of quarterly change have been calculated. Also the frequency of disagreement on direction of quarterly change has been determined. The results of these calculations have been reviewed in the contexts of two postwar business cycles and with reference to the methods of estimation employed by the Department of Commerce.

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