This type of sample design error can occur even when the population is correctly specified and a proper sample frame is being used.

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Selection error refers to errors made in the process of selecting respondents from the sample frame. Even if the population is correctly specified and a proper sample frame is used, errors can occur in the selection process that result in a non-representative sample. This can lead to biased results and invalid conclusions. Examples of selection errors include undercoverage, nonresponse bias, and sampling errors.

This Type of Sample Design Error Can Occur Even When