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| Selection Bias Bias, Selection | Sampling Bias | Sampling Biases | Sampling Error | Selection Biases | Bias, Sampling | Biases, Sampling | Biases, Selection | Error, Sampling | Errors, Sampling | Sampling Errors The introduction of error due to systematic differences in the characteristics between those selected and those not selected for a given study. In sampling bias, error is the result of failure to ensure that all members of the reference population have a known chance of selection in the sample. |