Statistics Dictionary

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Undercoverage

In survey sampling, undercoverage is a type of selection bias . It occurs when some members of the population are inadequately represented in the sample.

A classic example of undercoverage is the Literary Digest voter survey, which predicted that Alfred Landon would beat Franklin Roosevelt in the 1936 presidential election. The survey sample suffered from undercoverage of low-income voters, who tended to be Democrats. Undercoverage is often a problem with convenience samples .

See also:   Bias in Survey Sampling