LearningCausesv1

Random sampling reduces systematic selection bias

Known selection probabilities prevent researchers from choosing only convenient cases.

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Output
A sample less shaped by deliberate or convenient selection
Input
A defined population and a genuinely random method for selecting members
Relationship

What connects the input and output?

Each eligible member has a known chance of selection independent of the researcher’s preferences. Nonresponse and coverage problems still require attention.

Sources

1
  1. www.itl.nist.gov: Random sampling reduces systematic selection biaswww.itl.nist.govUS-PUBLIC-DOMAIN

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