Sampling Methods and Types of Bias

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What is Undercoverage Bias?

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Undercoverage bias occurs when some members of the population are inadequately represented in the sample, leading to a sample that does not accurately reflect the population.

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What is Nonresponse Bias?

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Nonresponse bias occurs when individuals selected for the sample do not respond, and their absence affects the results, potentially skewing the data.

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What is Response Bias?

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Response bias refers to the tendency of respondents to answer questions inaccurately or falsely, often due to the wording of the question or social pressure.

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What is Voluntary Response Bias?

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Voluntary response bias occurs when individuals choose to participate in a survey or study, often leading to a sample that is not representative of the population.

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What is Convenience Sampling?

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Convenience sampling is a non-probability sampling method where the sample is taken from a group that is easily accessible, which can lead to bias.

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What is Stratified Sampling?

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Stratified sampling is a method where the population is divided into subgroups (strata) and random samples are taken from each stratum to ensure representation.

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What is Simple Random Sampling (SRS)?

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Simple random sampling is a method where every member of the population has an equal chance of being selected, ensuring a representative sample.

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What is Cluster Sampling?

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Cluster sampling involves dividing the population into clusters (often geographically) and then randomly selecting entire clusters to sample.

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What is Systematic Sampling?

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Systematic sampling is a method where you select every nth individual from a list or sequence, starting from a random point.

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What is the difference between Stratified and Cluster Sampling?

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Stratified sampling ensures representation from each subgroup, while cluster sampling selects entire groups without ensuring representation from each subgroup.