Parallel form and inter-item reliability: Oftentimes there is more than one way to measure the phenomenon in which we are interested. Assuming no changes in the sample subject, the question/questionnaire/indicator should return consistent results over multiple administrations. Test-retest reliability: Identical to the process described in the scale sample above, test-retest reliability relies upon administering the question to a subject multiple times. To that end, there are several methods that can be used to increase the reliability of a question or questionnaire. As with the example of the scale, a questionnaire which is unable to provide consistent results has little to no useful purpose. Even so, increasing the reliability of a question or questionnaire has important implications for our ability to use the results. If a scale is reliable, it will report the same weight for the same item measured successively (assuming the weight of the item has not changed).Īs is the case with validity, perfect reliability can be difficult, if not impossible, to achieve. Reliability is concerned with the consistency or dependability of a question, and is analogous to the repeated use of a scale.
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