The American Statistical Association is pleased to publish the report in the hope and expectation that it will prove useful to a wide readership. The association is fortunate to have had four such able statisticians as Robert Ferber, Professor of Economics and Business, Survey Research Laboratory, University of Illinois; Paul Sheatsley, Survey Director, National Opinion Research Center, University of Chicago; Anthony Turner, Chief of International Mathematical Statistical Staff, Statistical Methods Division, U.S. Bureau of the Census; and Joseph Waksberg, VicePresident, Westat, Inc., form the committee that undertook the work. It thanks them for their efforts. .

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