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Sampling Bias Terminology

Sampling Bias Terminology. Mrs. Clements. Census. An official, usually periodic enumeration of an entire population, often including the collection of related demographic information. Robert Goldenkoff, 2010 Census Video. Sample.

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Sampling Bias Terminology

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  1. Sampling Bias Terminology Mrs. Clements

  2. Census • An official, usually periodic enumeration of an entire population, often including the collection of related demographic information. • Robert Goldenkoff, 2010 Census Video

  3. Sample • a group drawn from a population and used to estimate the characteristics of the population. • A sample is used because a census is expensive, time –consuming and complex.

  4. Undercoverage(Selection) Bias GALLUP • occurs when the way that the sample is selected systematically excludes part of the population • Literary Digest: The Poll that Changed Polling VERSUS

  5. Sampling Frame • list of possible subjects who could be selected in a sample • If the sampling frame is not equal to the population, the sample will be biased in the same way the sampling frame is bias. S A M P L I N G

  6. Convenience (Judgmental) Sample • choosing the individuals that are easiest to reach • Mall Surveys • This is also an example of selection bias.

  7. Response Bias Occurs when the response of the sample is swayed by a factor other than the variable at hand • Wording of the question • Honesty • Order of the choices • Demeanor of the interviewer

  8. Non-Response Bias occurs when responses are not obtained from all individuals selected for inclusion in the sample • mail surveys • telephone surveys

  9. Voluntary Response Bias • self-selection • represents members of the population with strong opinions • Dancing with the Stars

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