High Yield Abstract Review for NBME Exams

[@jewairiaalajab4847]

that was so amazing DR. TIM am 100% sure that this channel will be like a sun ray.

[@Sam_1964]

Outstanding presentation

[@IshaSuraj-e1s]

Great work on these videos, super informative and helpful to study along with. :) Can we get a video on GI system please? Thank you!!!

[@Doctor_Tim]

Thanks for the kind words! I have been planning on doing a GI video, great suggestion!

[@Gela-e7t]

Awesome 😊thank you SO much❤

[@HT.100]

that null value thing still confuses me that is it 0 or 1

[@Doctor_Tim]

Good question, it's a very confusing subject! For a "ratio", the null value is 1 but for a "difference" the null value is 0. So it depends on if the measure of association is looking to find a difference between two groups or if it's trying to divide them and create a ratio. If you think about it conceptually, when you're trying to find if X is significantly different (greater or less) than Y, 0 would indicate there's no difference. However, if you take a ratio of X/Y to compare (for example a risk ratio), then the math doesn't work out for 0 to be a possibility. For example, if X is 1 and Y is 1 (X/Y = 1) and the ratio is 1, which means X and Y are essentially the same. So just always ask yourself when thinking about a null value, "what is the measure they're trying to establish" and once you decide if its a ratio vs. a difference you know if its 1 vs. 0

[@HT.100]

@@Doctor_Tim thanks for the explanation, doctor tim