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    statistical error on a fraction

    Hello, I want to compute the statistical error on R, ΔR, which is a fraction N1/N2. N1 and N2 are the sizes of two samples. The Poisson error on each would be sqrt(N) but I am unsure how to compute the uncertainty on R. Some internet search suggests that ΔR/R = ΔN1/N1 + ΔN2/N2. I have also...