[Turing-Southampton] S3RI seminar: Mario Cortina Borja, Thursday 2-3pm

[Helen Ogden]

Dear all,

On Thursday (6 December) at 2pm in 54 / 7035 (7B), we have an S3RI 
seminar from Mario Cortina Borja (University College London) on 
"Bayesian inference for bivariate copulas with additive models for 
dependence, marginal location, scale and shape: an application in 
paediatric ophthalmology". Details are given below.

The talk will be followed by tea and cake in the staff reading room on 
level 4 of building 54.

All are welcome!

Best wishes,
Helen

Bayesian inference for bivariate copulas with additive models for 
dependence, marginal location, scale and shape: an application in 
paediatric ophthalmology

Mario Cortina Borja, University College London

Motivated by data on visual acuity from a large sample of children aged 
between 3 and 8 years, we propose bivariate copula models with 
dependence parameters, and sinh-arcsinh marginal densities with 
location, scale and shape parameters that depend on a covariate through 
additive models. We perform inference about the unknown quantities of 
our model in the Bayesian framework using a Markov chain Monte Carlo 
algorithm. We apply our model to paediatric ophthalmic data to gain new 
insights about the processes which cause changes in visual acuity with 
respect to age, including the age-related nature of the copula 
dependence parameter. We analyse predictive distributions to identify 
children with unusual sight characteristics, distinguishing those who 
are bivariate, but not univariate outliers. In this way we provide an 
innovative tool that enables clinicians to identify children with 
unusual sight who may otherwise be missed.

Work in collaboration with Julian Stander and Luciana Dalla Valle 
(Plymouth), Brunero Liseo (Rome), Charlotte Taglioni (Padua), and Angie 
Wade (UCL).

For the current schedule of S3RI seminars, see 
https://tinyurl.com/s3riseminar

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