Results 21 to 30 of about 6,825,486 (291)

On the Existence and Uniqueness of the Maximum Likelihood Estimators of Normal and Lognormal Population Parameters with Grouped Data

open access: yesJournal of Probability and Statistics, 2009
Lognormal distribution has abundant applications in various fields. In literature, most inferences on the two parameters of the lognormal distribution are based on Type-I censored sample data.
Jin Xia, Jie Mi, YanYan Zhou
doaj   +1 more source

Beyond Zipf's Law: The Lavalette Rank Function and Its Properties. [PDF]

open access: yesPLoS ONE, 2016
Although Zipf's law is widespread in natural and social data, one often encounters situations where one or both ends of the ranked data deviate from the power-law function.
Oscar Fontanelli   +4 more
doaj   +1 more source

Research on fatigue life of steel wire ropes under impact loads based on double Pareto lognormal distribution

open access: yesAdvances in Mechanical Engineering, 2017
Fatigue damage is the most important failure mode of wire ropes, and models of cumulative fatigue damage of wire ropes under multiple impact loads have been proposed based on the principle of microdamage linear accumulation.
Ren Zhiqian, Chen Xun
doaj   +1 more source

The Truncated Lognormal Distribution as a Luminosity Function for SWIFT-BAT Gamma-Ray Bursts

open access: yesGalaxies, 2016
The determination of the luminosity function (LF) in Gamma ray bursts (GRBs) depends on the adopted cosmology, each one characterized by its corresponding luminosity distance.
Lorenzo Zaninetti
doaj   +1 more source

Testing Inverse Gaussian Versus Log Normal [PDF]

open access: yesThe Egyptian Statistical Journal, 1991
The inverse Gaussian distribution has been proposed as a model for distribution of life times. It is considered as an alternative to other observed distributions in particular to the lognormal.
S.A. Shaban
doaj   +1 more source

The mathematical formula of the intravaginal ejaculation latency time (IELT) distribution of lifelong premature ejaculation differs from the IELT distribution formula of men in the general male population [PDF]

open access: yesInvestigative and Clinical Urology, 2016
Purpose: To find the most accurate mathematical description of the intravaginal ejaculation latency time (IELT) distribution in the general male population. Materials and Methods: We compared the fitness of various well-known mathematical distributions
Paddy K.C. Janssen, Marcel D. Waldinger
doaj   +1 more source

An Approximate Closed Formula for European Mortgage Options

open access: yesTrends in Computational and Applied Mathematics, 2023
The aim of this paper is to investigate the use of close formula approximation for pricing European mortgage options. Under the assumption of logistic duration and normal mortgage rates the underlying price at the option expiry is approximated by ...
A. M. Lopez Galvan
doaj   +1 more source

An EM Algorithm for Double-Pareto-Lognormal Generalized Linear Model Applied to Heavy-Tailed Insurance Claims

open access: yesRisks, 2017
Generalized linear models might not be appropriate when the probability of extreme events is higher than that implied by the normal distribution. Extending the method for estimating the parameters of a double Pareto lognormal distribution (DPLN) in Reed ...
Enrique Calderín-Ojeda   +2 more
doaj   +1 more source

Variability in the Log Domain and Limitations to Its Approximation by the Normal Distribution

open access: yesCPT: Pharmacometrics & Systems Pharmacology, 2020
Pharmacometric models using lognormal distributions have become commonplace in pharmacokinetic–pharmacodynamic investigations. The extent to which it can be interpreted by traditional description of variability through the normal distribution remains ...
Jeroen Elassaiss‐Schaap   +1 more
doaj   +1 more source

Non-parametric projections of national income distribution consistent with the Shared Socioeconomic Pathways

open access: yesEnvironmental Research Letters, 2023
Understanding and projecting income distributions within countries and regions is important to understanding consumption trends and the distributional consequences of climate impacts and responses.
Kanishka B Narayan   +3 more
doaj   +1 more source

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