Search Results for author: Ioannis Kosmidis

Found 7 papers, 5 papers with code

Scalable Marked Point Processes for Exchangeable and Non-Exchangeable Event Sequences

1 code implementation30 May 2021 Aristeidis Panos, Ioannis Kosmidis, Petros Dellaportas

We adopt the interpretability offered by a parametric, Hawkes-process-inspired conditional probability mass function for the marks and apply variational inference techniques to derive a general and scalable inferential framework for marked point processes.

Point Processes Variational Inference

Empirical bias-reducing adjustments to estimating functions

1 code implementation11 Jan 2020 Ioannis Kosmidis, Nicola Lunardon

That penalized objective relates closely to information criteria for model selection, and can be further enhanced with plug-in penalties to deliver reduced-bias $M$-estimates with extra properties, like finiteness in models for categorical data.

Methodology Statistics Theory Statistics Theory 62F10, 62F12, 62J12

Jeffreys-prior penalty, finiteness and shrinkage in binomial-response generalized linear models

1 code implementation5 Dec 2018 Ioannis Kosmidis, David Firth

This paper studies the finiteness properties of the reduced-bias estimator for logistic regression that results from penalization of the likelihood by Jeffreys' invariant prior; and it provides geometric insights on the shrinkage towards equiprobability that the penalty induces.

Statistics Theory Methodology Statistics Theory 62J12, 62F10, 62F12, 62F03

Modelling rankings in R: the PlackettLuce package

1 code implementation29 Oct 2018 Heather L. Turner, Jacob van Etten, David Firth, Ioannis Kosmidis

This means that the worth of each item can always be estimated by maximum likelihood, with finite standard error.

Computation

Modeling outcomes of soccer matches

no code implementations4 Jul 2018 Alkeos Tsokos, Santhosh Narayanan, Ioannis Kosmidis, Gianluca Baio, Mihai Cucuringu, Gavin Whitaker, Franz J. Király

The parameters of the Bradley-Terry extensions are estimated by maximizing the log-likelihood, or an appropriately penalized version of it, while the posterior densities of the parameters of the hierarchical Poisson log-linear model are approximated using integrated nested Laplace approximations.

Mean and median bias reduction in generalized linear models

no code implementations11 Apr 2018 Ioannis Kosmidis, Euloge Clovis Kenne Pagui, Nicola Sartori

This paper presents an integrated framework for estimation and inference from generalized linear models using adjusted score equations that result in mean and median bias reduction.

Methodology 62J12, 62F03, 62F12

Two-way sparsity for time-varying networks, with applications in genomics

1 code implementation22 Feb 2018 Thomas E. Bartlett, Ioannis Kosmidis, Ricardo Silva

Separation of these two types of sparsity is achieved with the introduction of a novel prior structure, which draws on ideas from the Bayesian lasso and from copula modelling.

Methodology

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