validity and reliability of measures

Validity refers to the extent to which a measure accurately measures what it claims to measure. It ensures that the results obtained from the measure are meaningful and relevant to the concept being studied. Reliability, on the other hand, refers to the consistency and stability of a measure over time and across different situations. A reliable measure produces consistent results when administered multiple times, indicating that it is free from random errors or fluctuations. In summary, validity ensures the accuracy and relevance of a measure, while reliability ensures its consistency and stability. Both are essential in ensuring the quality and credibility of any measurement instrument or research study.

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