PSY 3307 Lecture 10: Reliability
24 Nov 2016
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Document Summary
In testing reliability refers to consistency and repeatability. If something is unreliable then it has measurement error. Bathroom scales vary by 1 kg, baby scales in hospitals vary only 20 grams. Baby scales in hospitals are required to be more precise because they (1) weigh less and (2) need to be precise for potential medical intervention. Reliability in measurement means it reflects true rather than chance factors. You are able to count on it as a form of measurement. If to evaluators have different rubrics that would not be a reliable measure. Because our test must accurately reflect our constructs. Obtained scores: total score gathered from the test. Error score: how much of the data can be attributed to error. Reliability coefficient: estimate of how errors effect your measurement, if this is low (0. 2) means it is inconsistent and there is a lot of error effecting your measurement.
