What Are Likelihood Ratios and How Are They Used 

I am a medical student and your videos are my go to when I want to brush up or learn about biostatistics and the like. They're so simple and easy to follow. They all make sense. Thank you Dr. Shaneyfelt.

pure gold - you are the godfather of applied medical statistics

The best video about likelihood ratio I’ve ever seen. Short and straight to the point.

This is the first time I actually manage to understand this material. Thank you!

Thank you! I've read so many websites - this is the first time I clearly understood this.

My Godd!! I only graduated 24 years back and finally I get it.

Thanks Terry - very helpful video, explained clearly and simply.

Simplified and well-presented.

Great material! Thank you so much

Thank you professor for explaining this to us.

these videos are very helpful!

Thank you, this is really helpful

Good one..!!

Thanks a lot from Brazil!!!!!

Subscribed due to this video. Brilliant and easy.

fantastic !!!

Unbelievably helpful.

Thanks for the explanation. Is It possible that the Negative Likeli Hood Ratio is - 1? Or does It have to be >/= 0?

clear.useful

Thank you. So if we are asked to plot out the post test, we need to dcide first what is our aim: role in disease (hence, we should use the positive likelyhood ration) or role put ( negative test)? Can"t thank you enough.

very goog , good job

Thank you so much

Thanks proffessor

Very nice explanation. In your example of infection I was wondering about using C reactive protein to rule out infection because the CI includes 1. Shouldn't I try to avoid tests that include 1 in the CI?

Where can you find the LRs from the most representative tests used in the clinical setting?

thank you so much^-^

Hello there, is the likelihood ratio posttest probability equivalent to positive predictive value?

So you're saying likelihood+ = P(E | H) / P(E | not H), and likelihood- = P(not E | H) / P(not E | not H)? So it's just a Bayesian update.

For the negative likelihood ratios all the confidence intervals cross one, so none of them should be used to rule out infection