use of sequential hot-deck imputation for the treatment of individual item nonresponse, and the use of variance estimates that ignore the contribution of item nonresponse, are methods that are no longer representative of the current state of the art. Furthermore, it is not clear that nonresponse and undercoverage for the ACS will be sufficiently similar to these problems for the long form that these various long-form weighting methods should be utilized in the ACS without additional supporting research. The particular problem of the treatment of item nonresponse is becoming increasingly important given the degree of nonresponse experienced in the 2000 census.



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