![]() ![]() Some items are more likely to generate a nonresponse than others: for example items about private subjects such as income. Missing data can occur because of nonresponse: no information is provided for one or more items or for a whole unit ("subject"). Missing data are a common occurrence and can have a significant effect on the conclusions that can be drawn from the data. In statistics, missing data, or missing values, occur when no data value is stored for the variable in an observation.
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