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Reliability and the discrimination of normal and pathological groups
The Journal of Nervous and Mental Disease
|November 1, 1983
Summary
This study challenges the idea that psychometric properties are unimportant when comparing schizophrenic and normal groups. The authors argue that neglecting reliability and other task characteristics leads to flawed conclusions in cognitive deficit research.
Area of Science:
- Psychology
- Psychiatry
- Cognitive Science
Background:
- A previous study questioned the necessity of psychometric properties in comparing schizophrenic and normal cognitive performance.
- This critique was based on a reanalysis of data concerning cognitive deficit measurement.
Purpose of the Study:
- To contest the conclusion that psychometric characteristics are irrelevant in comparing patient and control groups.
- To highlight the methodological flaws in the reanalysis that led to this conclusion.
Main Methods:
- Critically evaluating the reanalysis methodology used in the prior study.
- Applying established psychometric principles to the re-examined data.
Main Results:
- The reanalysis by Neufeld and Broga (1981) was based on an inappropriate statistical approach.
- This inappropriate analysis overlooked crucial psychometric principles, rendering its conclusions invalid.
Conclusions:
- Psychometric properties, such as reliability, are essential for accurate comparisons of cognitive abilities between pathological and normal groups.
- The original findings by Chapman and Chapman (1973) regarding cognitive deficit measurement remain valid when appropriate methods are used.