Equivalent-form measures consistency between two versions of an instrument. Test-retest measures consistency from one time to the next. Each measures consistency a bit differently and a given instrument need not meet the requirements of each. There are three major categories of reliability for most instruments: test-retest, equivalent form, and internal consistency. However, an instrument cannot be valid if it is not reliable. Whether those consistent results are valid is another question. From a research point of view, the scale seems to be reliable because whatever it is measuring, it is measuring it consistently. The scale is producing consistent results. Suppose I were to step off the scale and stand on it again, and again it read 15 pounds. If I were to stand on a scale and the scale read 15 pounds, I might wonder. Reliability (visit the concept map that shows the various types of reliability)Ī test is reliable to the extent that whatever it measures, it measures it consistently.
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