### Medical Definition of Mixed discrete-continuous random variable

**1.**
A random variable that may assume some values with probabilities and others with probability densities.
For example, in a 35-year-old man with familial polyposis of the colon, the distribution of time until malignant disease occurs consists of a probability that he already has cancer (which would be assigned the waiting time 0), a probability density of developing it in the future and a probability that he will die of some other cause before he develops cancer.
(05 Mar 2000)

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