HSS 2381 Chapter Notes - Chapter 5: Sampling Distribution, Null Hypothesis, Central Limit Theorem

• School: University of Ottawa
• Department: Health Sciences
• Course: HSS 2381
• Professor: Kerry- Ann Hogan

Document Summary

Eg. from 100 people 20 got infected over a yr. risk is 20/100 odds is 20/80. Or as estimate of the rr but not for case-control studies. Assessed subjective, proportion of equally likely outcomes, outcomes observed in the long run. Independent events: if probability of event b happening is not affected by event a. Dependent events: if the events are affected by each other. Chapter 5 probability- important & complex field of study. Relative risk(rr) vs absolute risk(ar) linkage with probability. Notation (cid:862)h(cid:863) = eve(cid:374)t (cid:862)p(cid:894)(cid:895)(cid:863) = pro(cid:271)a(cid:271)ilit(cid:455) of eve(cid:374)t. Measures of disease association: chance of something happening can be expressed as risk and/or odds. Risk =the chances of something happening/ out of chances of all things happening. Odds =the chances of something happening/ out of chances of it not happening. Odds: proportion of people in each risk group who have the adverse outcome, relative to the proportion who do not.