Behavioral and Brain Sciences

Open Peer Commentary

Frequency formats are a small part of the base rate story

Dale Griffina1, Derek J. Koehlera2 and Lyle Brennera3

a1 Sauder School of Business, University of British Columbia, Vancouver, BC V6T 1Z2, Canada

a2 Department of Psychology, University of Waterloo, Waterloo, ON N2L 3G1, Canada

a3 Warrington College of Business, University of Florida, Gainesville, FL 32611.


Manipulations that draw attention to extensional or set-based considerations are neither sufficient nor necessary for enhanced use of base rates in intuitive judgments. Frequency formats are only one part of the puzzle of base-rate use and neglect. The conditions under which these and other manipulations promote base-rate use may be more parsimoniously organized under the broader notion of case-based judgment.

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