BIAS (STATISTICS)

In statistics, the term 'bias' is used for describing several different concepts:

★ A biased sample is one in which some members of the population are more likely to be included than others.

★ The bias of an estimator is the difference between an estimator's expectation and the true value of the parameter being estimated.

★ Systematic bias and systemic bias are external influences that may affect the accuracy of statistical measurements.