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Question: Reverse CDF

Question:Reverse CDF

James Cicon 13 Maple
July 13 2007
1
The CDF function permits you to get a probability, given a random variable x. But how do I get the random variable x, given the probability? I have tried using the solver to do this: df := 29: chiSquare := RandomVariable(ChiSquare(df)): solve(CDF(chiSquare, x) = .95, x) But this code only returns the following warning: "Warning, solutions may have been lost" But even if the code did work, using a numerical solver for this kind of thing sucks. Surely Maple has a routine that does a revesre lookup? Can someone please give me some pointers on this? Jim Cicon
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