Is a critical tool for avoiding errors while working with skewed data. Assuming an event A, such as a percentage of patients with cancer, or the number of actual drug users in a population. And an event B which is a positive test result for cancer, drug use, whatever... If the test is positive when the actual event has occurred some percentage of the time p(BA), and negative when it should be by some percentage p(¬B¬A) aka the opposite of it being positive when it should not be p(B¬A), Bayes Rule tells us what the actual chance that the event A has happened give a positive test result B.
p(AB) = ( p(BA) * p(A) ) / p(B)
Where A and B are events. p(A) and p(B) are the probabilities of those events. p(BA) is the probability of seeing B if A is true. p(B) can be calculated as p(BA) * p(A) + p(B¬A) * p(¬A) where ¬ denotes NOT. e.g. p(¬A) = 1  p(A)
Also:
See also:
file: /Techref/method/ai/bayesrule.htm, 2KB, , updated: 2017/4/19 13:58, local time: 2018/6/24 16:07,

©2018 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions? <A HREF="http://www.piclist.com/techref/method/ai/bayesrule.htm"> Bayes Rule</A> 
Did you find what you needed? 
PICList 2018 contributors:
o List host: MIT, Site host massmind.org, Top posters @20180624 RussellMc, Van Horn, David, Sean Breheny, Isaac M. Bavaresco, Neil, David C Brown, Bob Blick, Denny Esterline, Brent Brown, James Cameron, * Page Editors: James Newton, David Cary, and YOU! * Roman Black of Black Robotics donates from sales of Linistep stepper controller kits. * Ashley Roll of Digital Nemesis donates from sales of RCL1 RS232 to TTL converters. * Monthly Subscribers: Gregg Rew. ongoing support is MOST appreciated! * Contributors: Richard Seriani, Sr. 
Welcome to www.piclist.com! 
.