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Related Experiment Video

Updated: Apr 7, 2026

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Is Co-norming Required?

Martin L Rohling1, Ronald M Miller2, Bradley N Axelrod3

  • 1Department of Psychology, University of South Alabama, Mobile, AL, USA mrohling@southalabama.edu mrohling59@comcast.net.

Archives of Clinical Neuropsychology : the Official Journal of the National Academy of Neuropsychologists
|July 9, 2015
PubMed
Summary
This summary is machine-generated.

Co-norming test batteries is not essential for competent clinical practice. This study found that different normative systems yield similar and clinically meaningful results, challenging previous assumptions.

Keywords:
Cognitive Test NormsForensic NeuropsychologyNeuropsychological AssessmentNeuropsychologyNormative StudiesPsychological Assessment

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Area of Science:

  • Psychometrics
  • Clinical Psychology
  • Neuropsychology

Background:

  • Test batteries are crucial tools in clinical psychology and neuropsychology.
  • The use of co-normed, fixed batteries has been advocated for standardized assessment.
  • The necessity of co-norming for accurate interpretation remains debated.

Purpose of the Study:

  • To evaluate the necessity of co-norming in test batteries.
  • To compare the clinical utility of co-normed, meta-regressed, and hybrid normative systems.
  • To determine if co-norming significantly impacts score interpretation in referred patients and volunteers.

Main Methods:

  • Analysis of two distinct samples: 330 referred patients and 99 undergraduate volunteers.
  • Comparison of T scores derived from three normative systems: co-normed, meta-regressed, and a hybrid approach.
  • Statistical analysis of Overall Test Battery Means (OTBMs) and inter-system correlations.

Main Results:

  • T scores across the three normative systems were highly correlated (>.90) and similar in magnitude for both referred patients and volunteers.
  • Observed differences in OTBMs between normative systems were minimal and not clinically significant.
  • The co-normed, hybrid, and meta-regressed OTBMs for referred patients were 43.8, 45.0, and 43.9, respectively.
  • The co-normed, hybrid, and meta-regressed OTBMs for volunteers were 47.4, 47.5, and 47.1, respectively.

Conclusions:

  • Co-norming is not a prerequisite for competent clinical practice when using test batteries.
  • Alternative normative systems, such as meta-regression, provide comparable and clinically meaningful results.
  • The findings challenge the long-held assumption that fixed, co-normed batteries are essential for accurate psychological and neuropsychological assessment.