Health Sciences 2801A/B Lecture Notes - Lecture 4: Internal Consistency, Observational Error, Confidence Interval
27 Oct 2017
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Document Summary
Drawn from the same item universe multiple indicator instrument. Satisfaction of life scale by an unpredictable amount. Equally likely to raise the score and lower the score and would cancel themselves out if there were an infinite number of measurements: the correlation b/w the existing instrument and average of all other possible instruments. Relationship b/w mark i got on my 16 questions vs. the other possible combinations of 16 questions. Internal consistency concerned w/ unsystematic errors that is obtained during the use of a. Unsystematic error type of measurement error that increase or decreases individual scored. The indicators that make up an instrument are a part of a large hypothetical collection of indicators (item universe) that serve to represent a specific construct. Internal consistency is conceived to be an estimate of . A widely used measure of this construct is alpha: In a hypothetical world, a person"s observed score would be equal to their true score (without measurement error)
