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At the U.S. Bureau of the Census, data in economic surveys may occasionally be missing as a result of a company's failure to respond to a certain question, for example. In addition, values of other variables may require editing because they are clearly implausible. Implausible (outlying) values may arise as a result of the failure of the respondent to understand the survey question. This paper develops a strategy for cleaning survey data with missing and outlying values in three stages: 1) detection of outlying cases; 2) detection of outlying values within outlying cases; and 3) imputation of likely values for missing and/or outlying and edited values. Methodological tools include distance measures, graphical procedures, and maximum likelihood and robust estimation for incomplete multivariate normal data. Data from the Annual Survey of Manufactures (ASM) are used to illustrate the method.
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