NDLI: On splitting and merging categories: A regression account of subadditivity

Content Provider	Springer Nature Link
Author	Fiedler, Klaus Unkelbach, Christian Freytag, Peter
Copyright Year	2009
Abstract	Frequency judgments tend to be subadditive: A category’s frequency is judged to be lower than the summed frequency of its subcategories. Thus, by splitting or merging categories, subjective frequencies increase or decrease, respectively. We offer an account of this phenomenon that is based on the statistical principle of regression. Because empirical information is never noise-free, high frequencies are underestimated, and low frequencies are overestimated. The underlying regression principle explains available evidence on subadditivity and allows novel predictions. The findings from two experiments supported predictions derived from the regression account of frequency estimates for split and merged categories: Subadditivity varied systematically as a function of the two parameters determining regression (extremity and reliability). More extreme frequencies and reduced reliability led to increased regression effects. Theoretical implications for subadditive judgments (of frequency, probability, and/or value) are discussed. Although other factors may contribute to subadditivity, their influence needs to exceed the baseline expected from the regression model alone.
Starting Page	383
Ending Page	393
Page Count	11
File Format	PDF
ISSN	0090502X
Journal	Memory & Cognition
Volume Number	37
Issue Number	4
e-ISSN	15325946
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cognitive Psychology
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Arts and Humanities Medicine Neuropsychology and Physiological Psychology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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