Last week we discussed test characteristics like sensitivity and specificity. This week, we'll talk about how those concepts get used in actual medical decision making. At least, we'll talk about how they're supposed to be used. You'll learn about Bayes' Theorem, too! Don't let the equations scare you. You're going to learn a ton. Likelihood Ratios: http://ktclearinghouse.ca/cebm/glossary/lr Fagan's Nomogram: http://mcmasterevidence.files.wordpress.com/2013/02/fagan-nomogram.jpg John Green -- Executive Producer Stan Muller -- Director, Producer Aaron Carroll -- Writer Mark Olsen - Graphics http://www.twitter.com/aaronecarroll http://www.twitter.com/crashcoursestan http://www.twitter.com/realjohngreen http://www.twitter.com/olsenvideo