Jonathan J. Koehler (1994) Fallacy Under Fire: Round 2 . Psycoloquy: 5(21) Base Rate (13)
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Psycoloquy 5(21): Fallacy Under Fire: Round 2

FALLACY UNDER FIRE: ROUND 2
Reply to Fletcher, Funder and Macchi on Base-rate

Jonathan J. Koehler
Department of Management Science &
Information Systems
University of Texas at Austin
Austin TX 78712-1175

Koehler@utxvm.cc.utexas.edu

Abstract

Commentators Fletcher, Funder and Macchi question the significance of laboratory studies that purportedly demonstrate failings in human probabilistic judgment. Fletcher and Funder challenge the usefulness of Bayes' theorem for assessing human judgment and Funder offers alternative standards. Macchi does not challenge the standard, but argues that the alleged base rate fallacy arises from ambiguous information transmission in the laboratory problems. These commentaries bolster conclusions drawn in the target article and suggest that we do not yet understand how well people reason in real-world base rate tasks.

Keywords

Base rate fallacy, Bayes' theorem, decision making, ecological validity, ethics, fallacy, judgment, probability.

References