Calculating Probability

Perl – Think Again

Article from Issue 165/2014

To tackle mathematical problems with conditional probabilities, math buffs rely on Bayes' formula or discrete distributions, generated by short Perl scripts.


The Monty Hall problem is loved by statisticians around the world [1]. You might be familiar with this puzzle, in which a game show host offers a contestant a choice of three doors – behind one door is a prize, but the other two doors only reveal goats. After the contestant chooses a door, the TV host opens a different door, revealing a goat, and asks the candidate to reconsider (Figure 1). Who would have thought that probabilities in a static television studio could change so dramatically just because the host opens a door without a prize?

Figure 1: Hoping to win the car, the contestant chooses door 1. The host, who knows which door leads to the car, then opens door 3, revealing a goat. He offers the contestant the option of picking another door. Does it make sense for the contestant to change their mind and go for door 2? (Source: Wikipedia)


Use Express-Checkout link below to read the full article (PDF).

Buy this article as PDF

Express-Checkout as PDF
Price $2.95
(incl. VAT)

Buy Linux Magazine

Get it on Google Play

US / Canada

Get it on Google Play

UK / Australia

Related content

  • recordMyDesktop

    A training video of a new application can really reduce the learning curve. The recordMyDesktop program is at an early stage of development but already stable enough for everyday use. We'll show you how to use the program to capture custom procedures in a desktop video.

  • Perl: Retouching Photos

    In many cases, whole series of digital images need the same kind of modifications, which forces the photo-grapher to repeat the same steps time and time again in GIMP. Have you ever considered retouching in Perl?

  • Perl: Automating Color Correction

    If you have grown tired of manually correcting color-casted images (as described in last month's Perl column), you might appreciate a script that automates this procedure.

  • MLDonkey

    The multi-network MLDonkey client gives users access to all the major file sharing networks. We’ll show you how to set up MLDonkey and how you can control the MLDonkey client with a KDE front end called KMLDonkey.

  • Pinger

    The Pinger network monitoring tool uses ping to look for switches and estimate cable lengths.

comments powered by Disqus

Direct Download

Read full article as PDF:

Price $2.95


njobs Europe
Njobs Netherlands Njobs Deutschland Njobs United Kingdom Njobs Italia Njobs France Njobs Espana Njobs Poland
Njobs Austria Njobs Denmark Njobs Belgium Njobs Czech Republic Njobs Mexico Njobs India Njobs Colombia