Unreliable performance by a respondent on a reliable measure is possible, but reliable performance on an unreliable measure is impossible.

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An unreliable measure is one that does not consistently measure what it is supposed to measure. If a respondent performs reliably on an unreliable measure, it means that they are consistently getting the same results, even though those results are not accurate. This is impossible, because if a measure is unreliable, it cannot consistently measure anything.

Unreliable Performance by a Respondent on a Reliable Measure Is