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Unformatted text preview: those that choose to respond. Both generally biased. Selection bias tendency to exclude/include certain type of unit. Nonresponse bias distortions that arise from those that do not respond out of a large sample size. Response bias distortions that arise b/c of wording of Q or behavior of interviewer. Simple random sample every possible sample has the same chance of being selected. Stratified random sample dividing population into like-groups and random sampling from those groups. 1-in-k systematic sample order units of population, randomly select one-k- select every k unit. Cluster sample grouped-whole cluster is sampled....
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- Winter '08