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 [email protected]

a2 Department of Psychology, University of Waterloo, Waterloo, ON N2L 3G1, Canada [email protected]

a3 Warrington College of Business, University of Florida, Gainesville, FL 32611. [email protected]


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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