Response and non-response.

The article provides information on the strategy used to reduce impact of non-response at the Monthly Retail Trade Survey. It states that the primary method to lessen the impact at sampling is to expand the sample size through the use of over-sampling rates that have been decided from similar surveys. It avers that besides the methods to lessen the impact of non-response at collection, the non-responses to the survey that happen are treated through imputation.