Reliability is the stability, consistency, and precision of a given measure
There are statistical measures that assess the amount of measurement error in a survey, the reliability coefficient and the standard error of measurement (SEM). The SEM is like a "bell-curve" for an individual person's true ability that is based on the amount of error associated with the measure. As reliability increases, the SEM will constrict and we can become more confident that an individual's observed score on the survey is indicative of their true score or ability. The inverse holds true as well. As reliability decreases, the SEM will widen and we become less confident that an individual's observed score is indicative of their true score.
Types of reliability
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