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Confidence intervals for true scores and retest scores on clinical tests
Author(s) -
Brophy Alfred L.
Publication year - 1986
Publication title -
journal of clinical psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.124
H-Index - 119
eISSN - 1097-4679
pISSN - 0021-9762
DOI - 10.1002/1097-4679(198611)42:6<989::aid-jclp2270420626>3.0.co;2-q
Subject(s) - confidence interval , wechsler adult intelligence scale , psychology , standard error , statistics , test score , test (biology) , intelligence quotient , wechsler preschool and primary scale of intelligence , standard score , psychometrics , wechsler intelligence scale for children , clinical psychology , cognition , mathematics , psychiatry , standardized test , paleontology , biology
Procedures are described for setting confidence intervals for a true score and a retest score given an obtained score. The confidence intervals are functions of the estimated true score (not the obtained score) and either the standard error of the true score or the standard error of estimate of the retest score. Errors that result from the customary but incorrect use of confidence intervals are analyzed for IQ scores on the Wechsler Intelligence Scale for Children‐Revised and the Wechsler Adult Intelligence Scale‐Revised. Simple equations are given to establish confidence intervals for scores on any test.