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This report focuses on the characteristics of nonrespondents to the 2002 NSAF and assesses the impact of nonreponse on the NSAF statistics. It includes analysis of the effectiveness of the call attempt and refusal conversion strategies across all three rounds of NSAF data collection, providing some insights on how the level of effort affects the quality of the data by reducing nonresponse. This report also includes a sociodemographic comparison of nonrespondents using census block information obtained for 2002 nonrespondents and respondents.