Pub. date: 2008 | Online Pub. Date: June 25, 2008 | DOI: 10.4135/9781412963978 | Print ISBN: 9781412909280 | Online ISBN: 9781412963978| Publisher:SAGE Publications, Inc.About this encyclopedia
Steven J. Osterlind
Appraisal of human characteristics—such as achievement, ability, proficiency, attitude, belief, or another construct—is routinely accomplished through administration of a test, which is itself often carefully developed and administered by standardized protocols. Examinees and other test users are usually interested only in the results yielded by a test administration; generally they are not attuned to characteristics or technical features of the instrument itself. Still, many persons who use test results realize that the usefulness and appropriateness of test-score interpretation is a direct result of the test's internal characteristics. The internal attributes of a test are technically termed its psychometric properties . Psychometric properties are characteristics of tests and other measures of human characteristics that identify and describe attributes of an instrument, such as its reliability or appropriateness for use in a particular circumstance. Most commonly, psychometric properties provide information about a test's appropriateness, meaning-fulness, and usefulness—in other words, its validity. As ...