The risk ratio (RR), also called the relative risk, is the ratio of the probability of cancer in smokers to the probability of cancer in nonsmokers RR = (a/(ab))/(c/(cd)) = (a(cd))/(c(ab)) Given that you know a, b, c, and d, you can compute either of these metrics Yet odds ratio is strongly preferred as the "right" metric to report in almost all scenarios That Note that the odds ratio and relative risk are both greater than 1, which tells us that the chances of experiencing some event (eg passing the skills test) is greater in the treatment group compared to the control group The odds ratio and relative risk give us similar information, but we interpret each value in slightly different ways In particular The odds ratio tells us thatNumber with positive outcome a c ac Number with negative outcome b d bd Total ab cd abcd Several statistics can be calculated
Measures Of Effect Relative Risks Odds Ratios Risk
