, Volume 18, Issue 2, pp 93–96

Conditionalization, A New Argument For

  • Bas C. van Fraassen

DOI: 10.1023/A:1006286003463

Cite this article as:
van Fraassen, B.C. Topoi (1999) 18: 93. doi:10.1023/A:1006286003463


Probabilism in epistemology does not have to be of the Bayesian variety. The probabilist represents a person's opinion as a probability function; the Bayesian adds that rational change of opinion must take the form of conditionalizing on new evidence. I will argue that this is the correct procedure under certain special conditions. Those special conditions are important, and instantiated for example in scientific experimentation, but hardly universal. My argument will be related to the much maligned Reflection Principle (van Fraassen, 1984, 1995), and partly inspired by the work of Brian Skyrms (1987).

Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Bas C. van Fraassen
    • 1
  1. 1.Princeton UniversityUSA

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