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2024 Jan 23
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Quantiles of sums of independent discrete random variables
...s), the computation of such a convolution is quite fast. (B) Characteristic function: X will be approximated with Y=X+Z, where Z is normal N(0,sigma) with small sigma. Y has a density (which it is impossible to compute directly) but the characteristic function (_continuous_ Fourier transform) cf_Y of Y can easily be computed analytically (without knowing the density of Y) Now let s be a numeric vector. I want to get the density f_Y(s) of Y evaluated along s. The proper way of doing this would be to apply the inverse continuous Fourier transform to the function cf_Y at each point in s. Thi...