REGISTER   |   SUBSCRIBE   |   E-MAIL ALERTS   |   HELP |   SIGN OUT    

Home   |   Print edition   |   Advertising  |   Buyers Guide   |   Jobs   |   Events calendar   |   RSS feeds
  • Table of contents
  • Past issues

yellow star Featured Jobs

  • Search jobs
  • Post jobs
letters

Bayesian Probability and One Bad Apple

The brilliant, attention-capturing sentences at the beginning of Michael Berry's "Singular Limits" (Physics Today, May 2002, page 10) appear untenable unless one considers conditional (Bayesian) probability. In fact, biting an apple and finding no maggot may indicate either the worst or the best experience of the apple eater. Respectively, the eater may have swallowed the entire maggot with some bite or no maggot at all. The outcome depends on a preexisting condition: the presence, or absence, of a single apple inhabitant.

Real things may be even more complex: A particularly unfortunate eater may have gotten an apple with multiple maggots. The situation described also appears to be a suitable illustration of the collapse of probability by observation.

Bruno Lunelli
(blunelli@ciam.unibo.it)
University of Bologna
Bologna, Italy

  • Article Tools
  • Enlarge text   Enlarge text
  • Shrink text   Shrink text
  • Printer-friendly formatPrinter-friendly format
  • Download PDFDownload PDF
  • E-mail this articleE-mail this article
  • Comment on this articleWrite a letter to the editor
  • Free this month
  • Technical and Policy Issues of Counterterrorism—A Primer for Physicists
  • Dark Energy: Just What Theorists Ordered
  • Kick-Starting Developing Economies With Relevant Technologies
  • Exact Change Needed, No Boom Boxes, Do Physics
  • New Books
  • Letters
  • Most popular articles
  • Month-long calculation resolves an 82-year-old quantum paradox
    September 2009
  • Friction, force chains, and falling fruit
    September 2009
  • US electricity grid still vulnerable to electromagnetic pulses
    September 2009
  • A ghost image violates a Bell inequality
    August 2009
    • Related from the archive
    • Singular Limits

    Request product info

     

     


    SERVICES
    Physics Today Jobs
    Physics Today Buyers Guide
    Research Today
    NEWS
    News Picks
    We Hear That Society News
    Event Calendar
    Obituaries
    THE MAGAZINE
    This month in print
    Past Issues
    Institutional subscriptions
    Information for advertsers
    READER SERVICE
    Register
    Sign in
    Subscribe
    Email alert
    MORE INFO
    Contact us
    About Physics Today
    Privacy Policy
    Terms & Conditions
    Copyright © 2009 by the American Institute of Physics - All rights reserved