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Whose IQ is it?--Assessor bias variance in high-stakes psychological assessment.
- Source :
-
Psychological assessment [Psychol Assess] 2014 Mar; Vol. 26 (1), pp. 207-14. Date of Electronic Publication: 2013 Nov 04. - Publication Year :
- 2014
-
Abstract
- Assessor bias variance exists for a psychological measure when some appreciable portion of the score variation that is assumed to reflect examinees' individual differences (i.e., the relevant phenomena in most psychological assessments) instead reflects differences among the examiners who perform the assessment. Ordinary test reliability estimates and standard errors of measurement do not inherently encompass assessor bias variance. This article reports on the application of multilevel linear modeling to examine the presence and extent of assessor bias in the administration of the Wechsler Intelligence Scale for Children-Fourth Edition (WISC-IV) for a sample of 2,783 children evaluated by 448 regional school psychologists for high-stakes special education classification purposes. It was found that nearly all WISC-IV scores conveyed significant and nontrivial amounts of variation that had nothing to do with children's actual individual differences and that the Full Scale IQ and Verbal Comprehension Index scores evidenced quite substantial assessor bias. Implications are explored.<br /> (2014 APA)
- Subjects :
- Adolescent
Affective Symptoms diagnosis
Attention Deficit Disorder with Hyperactivity diagnosis
Child
Female
Humans
Intellectual Disability diagnosis
Learning Disabilities diagnosis
Male
Observer Variation
Reproducibility of Results
Affective Symptoms epidemiology
Attention Deficit Disorder with Hyperactivity epidemiology
Intellectual Disability epidemiology
Intelligence
Learning Disabilities epidemiology
Wechsler Scales statistics & numerical data
Subjects
Details
- Language :
- English
- ISSN :
- 1939-134X
- Volume :
- 26
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Psychological assessment
- Publication Type :
- Academic Journal
- Accession number :
- 24188149
- Full Text :
- https://doi.org/10.1037/a0034832