A clustering algorithm for overlapping Gaussian mixtures

P Economou - Research in Statistics, 2023 - Taylor & Francis
Gaussian mixture models (GMM) are widely used as a probabilistic model for density
estimation for multivariate data and as an unsupervised clustering algorithm to provide a soft …

Inference under multivariate size-biased sampling

A Batsidis, G Tzavelas, P Economou - Journal of Applied Statistics, 2025 - Taylor & Francis
The present research deals with statistical inference for the expectation of a function of a
random vector based on biased samples. After highlighting with the help of a motivating …

Comparing first hitting time and proportional hazards regression models

D Stogiannis, C Caroni… - Journal of Applied …, 2011 - Taylor & Francis
Cox's widely used semi-parametric proportional hazards (PH) regression model places
restrictions on the possible shapes of the hazard function. Models based on the first hitting …

Statistical inference for the size-biased Weibull distribution

G Tzavelas, D Panagiotakos - Journal of Statistical Computation …, 2013 - Taylor & Francis
In this paper, statistical inferences for the size-biased Weibull distribution in two different
cases are drawn. In the first case where the size r of the bias is considered known, it is …

Hypothesis testing for the population mean and variance based on r-size biased samples

P Economou, A Batsidis, G Tzavelas, D Bagkavos - Statistics, 2021 - Taylor & Francis
The present research deals with hypothesis testing for the population mean and variance
based on r-size biased samples. Specifically, consistent and asymptotically normally …

Kullback–Leibler divergence measure based tests concerning the biasness in a sample

P Economou, G Tzavelas - Statistical Methodology, 2014 - Elsevier
In this paper two tests are proposed, based on the Kullback–Leibler divergence measure, for
testing hypotheses concerning the existence and the nature of bias in samples. The first is …

Characterization properties of the log-normal distribution obtained with the help of divergence measures

G Tzavelas, P Economou - Statistics & Probability Letters, 2012 - Elsevier
The aim of this work is to provide some characterization properties of the log-normal
distribution with the help of divergence measures between a probability density function f …

Στατιστικά μοντέλα για δεδομένα διάρκειας ζωής

ΔΕ Στογιάννης - 2012 - dspace.lib.ntua.gr
Μια κατανομή που βρίσκει μεγάλη εφαρμογή σε στατιστικά μοντέλα για την ανάλυση
δεδομένων διάρκειας ζωής είναι η αντίστροφη Γκαουσιανή κατανομή (Inverse Gaussian-IG) …

Sample tests for detection of size-biased sampling mechanism

P Economou, G Tzavelas - Communications in Statistics-Theory …, 2013 - Taylor & Francis
The aim of this article is to present a new test for the detection of size-bias in a sample with
or without censored observations. The test is simple in the form and demands only the …

[引用][C] George Tzavelas Department of Statistics and Insurance Science, University of Piraeus, 80 Karaoli & Dimitriou str., 185 34 Piraeus, Greece tzafor@ unipi. gr

P Economou