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Normal-exponential-gamma distribution : ウィキペディア英語版 | Normal-exponential-gamma distribution
In probability theory and statistics, the normal-exponential-gamma distribution (sometimes called the NEG distribution) is a three-parameter family of continuous probability distributions. It has a location parameter , scale parameter and a shape parameter . ==Probability density function== The probability density function (pdf) of the normal-exponential-gamma distribution is proportional to :, where ''D'' is a parabolic cylinder function.〔http://www.newton.ac.uk/programmes/SCB/seminars/121416154.html 〕 As for the Laplace distribution, the pdf of the NEG distribution can be expressed as a mixture of normal distributions, : where, in this notation, the distribution-names should be interpreted as meaning the density functions of those distributions.
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