I have to admit when it comes to biostats I have trouble with any question that has calculations. I don't understand RR, OR, NNT, hazard ratios, all that stuff just confuses me. I got the UW biostats and I was disappointed. The question w/in the CK qbank were better. I need some really good help. Does anyone know of a good book that can help for the step 3. I appreciate any advice.