From: Bias magnification in ecologic studies: a methodological investigation
 | Individual (interior cells) | Ecologic (margins) | ||||
---|---|---|---|---|---|---|
 | exposed | unexposed | sum | exposed | unexposed | sum |
cases | 16 | 12 | 28 | ? | ? | 28 |
noncases | 24 | 48 | 72 | ? | ? | 72 |
total | 40 | 60 | 100 | 40 | 60 | 100 |
risks | 0.4 | 0.2 | Â | X | 0.40 | Â |
RD | 0.2 | Â | Â | Y | 0.28 | Â |
 |  |  |  | n | 100 |  |