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| Feb 13 |
Tue |
Emmanouil Kalligeris (Sheffield) |
Statistics Seminar |
| 15:00 |
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A Twisted Markov Switching Mechanism for the Modelling of Incidence Rate Data
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Hicks Seminar Room J11 |
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Abstract:
Various time series models have been used over the years to capture the dynamic behaviour of significant variables in various scientific fields such as epidemiology, seismology, meteorology, finance, etc. In this work, a conditional mean Markov regime switching model with covariates is proposed and studied for the analysis of incidence rate data. The components of the model are selected by both penalised likelihood techniques in conjunction with the Expectation Maximisation algorithm, with the aim of achieving a high level of robustness with respect to modelling the dynamic behaviour of epidemiological data. In addition to statistical inference, changepoint detection analysis is used to select the number of regimes, reducing the complexity associated with likelihood ratio tests.
[Kalligeris EN, Karagrigoriou A, Parpoula C. (2023): On Stochastic Dynamic Modeling of Incidence Data. Int J Biostat, 10.1515/ijb-2021-0134]
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| Feb 27 |
Tue |
Prof. Robin Henderson (Newcastle University) |
Statistics Seminar |
| 15:00 |
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Event History and Topological Data Analysis
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Hicks Seminar Room J11 |
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Abstract:
Topological data analysis has become popular in recent years, though mainly outside the statistical literature. In this talk we review some of the elements of topological data analysis and we show links to event history and survival analysis. We argue that exploiting topological data as event history can be useful in the analysis of data in the form of images. We propose a version of the well-known Nelson-Aalen cumulative hazard estimator for the comparison of topological features of random fields and for testing parametric assumptions. We suggest a Cox proportional hazards approach for the analysis of embedded metric trees. The Nelson-Aalen method is illustrated on globally distributed climate data and on neutral hydrogen distribution in the Milky Way. The Cox method is used to compare vascular patterns in fundus images of the eyes of healthy and diabetic retinopathy patients.
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| Apr 16 |
Tue |
Dominic Grainger and Dr Ben Wigley (Sheffield) |
Statistics Seminar |
| 15:00 |
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Dominic: The Efficient Modelling of Individual Animal Movement in Continuous Time; Ben: Stressing over shape: A Procrustean investigation of dental fluctuating asymmetry.
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Hicks Seminar Room J11 |
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