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When individuals or households selected in the survey sample cannot or will not complete the survey there is the potential for bias to result from this non-response. Nonresponse bias occurs when the observed value deviates from the population parameter due to differences between respondents and nonrespondents.
* Measurement error: inaccurate reporting of the measure of interest due to cognitive difficulty in processing the survey request (e.g. difficulties of placing an event within or outside

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