A continuous random variable is said to be hyperexponential (or mixed exponential) when its probability density function is the convex sum of exponential density functions. The term hyperexponential is due to always having a coefficient of variation greater than 1, which is the coefficient of variation for an exponentially distributed random variable.
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(2013). Hyperexponential Distribution. In: Gass, S.I., Fu, M.C. (eds) Encyclopedia of Operations Research and Management Science. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-1153-7_200299
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DOI: https://doi.org/10.1007/978-1-4419-1153-7_200299
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