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URL The fraction of the exposed controls was
estimated to correspond to the 10% of the population of the district living in the
vicinity of the emission source Which parameter of the statistical power calculation is the limiting factor? -> the cases occurring in the observation perion in this selected district How can the power be improved? -> (1) increase the matching factor, but: The available budget allowed only a 1:1 frequency matching. -> (2) One-sided test can be taken into account, because a protective efffect of arsenic exposure on skin cancer development can likely be excluded. |