In this work, we show that the Dagum distribution may be a competitive model for describing
data which include censored observations in lifetime and reliability problems. Maximum …

In this paper, we study the 'wrong skewness phenomenon'in stochastic frontiers (SF), which
consists in the observed difference between the expected and estimated sign of the …

In this article, we define a new lifetime model called the Weibull–Dagum distribution. The
proposed model is based on the Weibull–G class. It can also be defined by a simple …

In this study, the exponentiated generalized exponential Dagum distribution has been
proposed and studied. This family of distribution consists of a number of sub-models such as …

In financial analysis it is useful to study the dependence between two or more time series as
well as the temporal dependence in a univariate time series. This article is concerned with …

Grouped data have been widely used to analyze the global income distribution because
individual records from nationally representative household surveys are often unavailable …

We study a new five-parameter model called the extended Dagum distribution. The
proposed model contains as special cases the log-logistic and Burr III distributions, among …

Male swordtails in the genus Xiphophorus display a conspicuous ventral elongation of the
caudal fin, the sword, which arose through sexual selection due to female preference …

Modern portfolio theory indicates that portfolio optimization can be carried out based on the
mean-variance model, where returns and risk are represented as the average and variance …

On the Kumaraswamy–Dagum–Log–Logistic sigmoid functions with applications to population
dynamics Page 1 Article Biomath Communications 5 (2018) Biomath Communications …