How was the incidence/odds ratio/risk ratio graph created?
Thu, 23 Oct 2008: Here’s how it was done (roughly): Use your computer to create a whole bunch of simulated data sets with difference levels of incidence. For each data set, calculate the odds ratio and the risk ratio. Then select all the data sets that have a particular risk ratio (RR) and plot them on the graph in terms of their incidence and odd ratio. For example, choose all the data sets that have a risk ratio = 2.0. Each one of these will have its own incidence and its own odds ratio. If you plot them all on the graph (with odds ratio on the y axis and incidence on the x axis), and draw a curve to connect all the points, you will have your RR = 2.0 curve. Now, do the same thing for all the data sets that have a risk ratio = 3.0. Now you’ve got two curves. Repeat for all the remaining RR data sets. Back to Top Question 19 on the practice test Mon, 13 Oct 2008: Question 19 is asking something relatively simple. You have the formula for margin of error, and unless you are told otherw
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