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Comments on the continuity of distribution functions obtained by superposition

Author: Barthel W. Huff
Journal: Proc. Amer. Math. Soc. 27 (1971), 141-146
MSC: Primary 60.20
MathSciNet review: 0270417
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Abstract: Let $ \{ X(t)\} $ be a differential process and $ Y$ a nonnegative random variable independent of the process. We consider whether the superposition $ X(Y)$ can have a continuous probability distribution. If the process has continuous distributions, then the superposition is continuous if and only if $ P[Y = 0] = 0$. If the process has discontinuous distributions and no trend, then no superposition can have continuous distribution. If the process has discontinuous distributions and nonzero trend, then the superposition onto a random epoch has continuous distribution if and only if $ Y$ has continuous distribution.

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Keywords: Superposition, infinitely divisible, Lévy parameters, differential process, random epoch, random sum
Article copyright: © Copyright 1971 American Mathematical Society

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