249Forensic Training, Education, and Institutes
likelihood ratio, such as how event A inuenced event B and B’s comple-
ment. By multiplying those two together we could solve for the posterior
odds.
Slide 65:
Now we are going to incorporate some values that have forensic mean-
ing. In this case “guilt” means the person in question committed the act
and le their DNA at the crime scene. For transfer evidence the likelihood
ratio portion of the equation is usually a very large number. e numerator
of the likelihood ratio component is the probability that the DNA evidence
matches the suspect’s given that he committed the crime. So, the forensic
analyst is essentially comparing DNA from the same person. e probabil-
ity of this event should be rela ...