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ERIC Number: ED393884
Record Type: RIE
Publication Date: 1995
Pages: 9
Abstractor: N/A
Reference Count: N/A
ISBN: N/A
ISSN: N/A
Use of Derived Comparison Scores in Clinical Settings.
Callahan, Joseph P.
Clinicians use a common practice of reporting age or grade equivalent derived scores, but problems of interpretation exist for such scores. This article examines derived comparison score issues and recommends use of scores of relative standing such as percentile ranks or standard scores in contrast to use of developmental scores like age and grade equivalents. Derivation of both age and grade equivalents is usually based on a hypothetical distribution of means with scores often interpolated and extrapolated along the distribution of means curve. Scores of relative standing such as percentile ranks offer a way for the clinician to interpret test scores when interval or ordinal measurement is used to obtain raw scores. The percentile family is still a derived score but is based on the percent of individuals taking the particular test. The interpretation for a specific percentile rank is that the individual scored as well or better than that percentage of individuals taking the test. Use of percentiles allows for fewer interpretative problems and calculation for any shape of distribution. (Contains six references.) (Author/SLD)
Publication Type: Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers: Percentile Ranks