I thank all for your reply. My question was not well formulated. I will do it again: Suppose that the random variable X is discrete with probability mass function (pmf) F (binomial, poisson, ....) not necessarily available in R. Is there a general method to get the quantiles (as qbinom, qpois, .....) or which is the method(s) used to get the quantiles (used in qbinom, qpois, .....)? Regards ML [[alternative HTML version deleted]]
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