![]() ![]() Reliability across time is often referred to as test-retest reliability or temporal stability. This consistency typically refers to performance of the test across time, across forms or across its items or parts. Reliability Reliability is essentially an index, or more precisely, a set of indices of a test s consistency. Below is a modest attempt to answer these questions as they pertain to the NWEA Achievement Level Tests (ALT) and Measures of Academic Progress (MAP). Yet, even though questions such as, Is the test valid and reliable? are commonly asked about a test, the answers to this question are not always clearly understood. ![]() Literally hundreds of journal articles and book chapters have been written about these interrelated topics. 1 Reliability and Validity Estimates NWEA Achievement Level Tests and Measures of Academic Progress Northwest Evaluation Association 5885 SW Meadows Road, Suite 200 Lake Oswego, Oregon (fax) March 2004ΔΆ A Few Notes About Reliability and Validity as They Are Reported in NWEA Reliability and Validity Estimates: Achievement Level Tests and Measures of Academic Progress Reliability and validity are two of the words most commonly associated with tests. ![]()
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