
A new heavy-tailed distribution is considered in this paper: the p-generalized Cauchy distribution. This new 5-parameter distribution family is substantially more flexible than than the classical Cauchy distribution, it contains, in particular, asymmetric distributions. Various numerical characteristics of the new distribution are considered, among them are fractional order moments and “twice incomplete” moments. There were obtained also (using numerical methods) values of quantile-based standardized moments of higher orders: Bowley’s skewness and Moors’ kurtosis. Suitability of the p-generalized Cauchy distribution for modeling real data was confirmed by fitting this distribution to a series of log returns of stock prices. The p-generalized Cauchy distribution had the smaller value of the AIC statistic than the Cauchy distribution, the skew Cauchy distribution, the generalized logistic distribution and the hyperbolic distribution.
У роботi розглядається новий розподiл iз важкими хвостами — p-узагальнений розподiл Кошi. Ця нова 5-параметрична сiм’я розподiлiв є значно гнучкiшою порiвняно з класичним розподiлом Кошi, зокрема, до неї входять i асиметричнi розподiли. Розглянутi рiзнi числовi характеристики нових розподiлiв, зокрема, моменти дробового порядку та “подвiйно неповнi” моменти. Також отриманi (числовими методами) значення нормованих центральних моментiв вищих порядкiв, що базуються на квантилях — асиметрiї Bowley та ексцеса Moors. Придатнiсть p-узагальненого розподiлу Кошi до моделювання реальних даних пiдтверджена пiдгонкою цього розподiлу до ряду приростiв логарифмiв цiн акцiй. При цьому для p-узагальненого розподiлу Кошi отримано менше значення статистики AIC, нiж для звичайного розподiлу Кошi, асиметричного розподiлу Кошi, узагальненого логiстичного розподiлу та гiперболiчного розподiлу.
асиметрiя Bowley, Moors’ kurtosis, розподiл Кошi, Cauchy distribution, неповнi моменти, ексцес Moors, incomplete moments, Bowley’s skewness
асиметрiя Bowley, Moors’ kurtosis, розподiл Кошi, Cauchy distribution, неповнi моменти, ексцес Moors, incomplete moments, Bowley’s skewness
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