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In January 2004, the Bureau of Labor Statistics (BLS) conducted a Response Analysis Survey (RAS) that elicited qualitative information related to survey response in the American Time Use Survey (ATUS.) This information was elicited from both respondents and people who refused to do the survey. The RAS was conducted to help the BLS better understand a person's propensity to respond or not to the ATUS, and to better understand to which survey features his or her response propensity is correlated.