18 citations · 50 across the 51 of their papers we have counts for
7 papers · 1 filter
Bivariate log-symmetric models: distributional properties, parameter estimation and an application to fatigue data analysis
Roberto Vila, Narayanaswamy Balakrishnan, Helton Saulo +1
The bivariate Gaussian distribution has been a key model for many developments in statistics. However, many real-world phenomena generate data that follow asymmetric distributions,…
Unit-log-symmetric models: Characterization, statistical properties and its use in analyzing internet access data
Roberto Vila, Narayanaswamy Balakrishnan, Helton Saulo +1
We present here a unit-log-symmetric model based on the bivariate log-symmetric distribution. It is a flexible family of distributions over the interval . We then discuss i…
Parametric quantile regression for income data
Helton Saulo, Roberto Vila, Giovanna V. Borges +1
Univariate normal regression models are statistical tools widely applied in many areas of economics. Nevertheless, income data have asymmetric behavior and are best modeled by non-…
Symmetric generalized Heckman models
Helton Saulo, Roberto Vila, Shayane S. Cordeiro
The sample selection bias problem arises when a variable of interest is correlated with a latent variable, and involves situations in which the response variable had part of its ob…
On Some Properties of the Beta Inverse Rayleigh Distribution
J. Leão, H. Saulo, M. Bourguignon +3
We study with some details a lifetime model of the class of beta generalized models, called the beta inverse Rayleigh distribution, which is a special case of the Beta Fréchet dist…
Parametric quantile autoregressive moving average models with exogenous terms applied to Walmart sales data
Alan Dasilva, Helton Saulo, Roberto Vila +2
Parametric autoregressive moving average models with exogenous terms (ARMAX) have been widely used in the literature. Usually, these models consider a conditional mean or median dy…
Theoretical results and modeling under the discrete Birnbaum-Saunders distribution
Filidor Vilca, Roberto Vila, Helton Saulo +2
In this paper, we discuss some theoretical results and properties of a discrete version of the Birnbaum-Saunders distribution. We present a proof of the unimodality of this model.…