Reliability is the degree of consistency of measurement in a test. A test is considered reliable if we get the same result repeatedly under the same conditions. A test can be reliable but not accurate, accurate but not reliable, neither accurate nor reliable, or both accurate and reliable.
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Many clinicians label a child as language impaired (LI) or typically developing (TD) based on arbitrary cutoff scores (1.5 SD below the mean or 1 SD below the mean) on standardized tests. However, as demonstrated in this article, many standardized tests do not even provide information about validity and reliability.
In this module, Cate discusses the validity of standardized tests and whether they measure what they claim to measure. Read More
In this module, Cate explains two types of reliability (test-retest and inter-examiner) in terms of standardized tests. Read More
The percentile rank of a score is percentage of total scores from the normative sample that were equal or lesser than the value of the score. It can be plotted on the bell curve of a normal distribution. Read More
Reliability is the degree of consistency of measurement in a test. A test has a high degree of reliability if it produces similar results consistently under similar conditions. Read More
The LEADERSproject by Dr. Catherine (Cate) Crowley is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
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