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Measurement: Reliability and Validity

1 Reliability & Validity -1 Measurement: Reliability and ValidityY520 Strategies for Educational InquiryRobert S MichaelReliability & Validity -2 Introduction: Reliability & Validity All measurements, especially measurements of behaviors, opinions, and constructs, are subject to fluctuations (error) that can affect the measurement s Reliability and Validity . Reliabilityrefers to consistencyor stabilityof measurement. Can our measure or other form of observation be confirmed by further measurements or observations? If you measure the same thing would you get the same score? Validityrefers to the suitabilityor meaningfulnessof the measurement. Does this instrument describe accurately the construct I am attempting to measure?

4 Reliability & Validity-7 Internal Consistency: Homogeneity Is a measure of how well related, but different, items all measure the same thing. Is applied to groups of items thought to measure different aspects of the same concept. A single item taps only one aspect of a concept. If several different items are used to gain information

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