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Measurement Error

Definition

Measurement error refers to inaccuracies or variations that occur when measuring variables or collecting data from individuals or objects. It can arise from various sources such as faulty instruments, human errors, or inconsistencies in respondents' answers.

Analogy

Think about taking measurements using different rulers - some may be slightly longer or shorter than others due to manufacturing defects. These measurement errors can lead to discrepancies between what we measure and what actually exists.

Related terms

Reliability: Reliability measures how consistent and stable measurements are over repeated trials or observations. High reliability indicates low measurement error.

Validity: Validity refers to whether an instrument or measurement accurately measures what it intends to measure without significant biases or errors.

Systematic Error: Systematic error is a type of measurement error that consistently occurs in the same direction, leading to consistent overestimation or underestimation. It is not due to random chance.