Evaluating mcmc convergence in a bayesian model of st-elevation myocardial infarction female patients in Malaysia

Nurliyana Juhan and Yong Zulina Zubairi and Ahmad Syadi Mahmood Zuhdi and Zarina Mohd Khalid (2024) Evaluating mcmc convergence in a bayesian model of st-elevation myocardial infarction female patients in Malaysia. Journal of Advanced Research in Applied Sciences and Engineering Technology. pp. 1-11. ISSN 2462-1943

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Abstract

The majority of research that looked at the Bayesian Markov Chain Monte Carlo (MCMC) approach for prognostic modelling of cardiovascular disease only focused on the use of the Bayesian approach in variable selection, model selection, and prior distribution selection. But very few of this research has looked at the Markov chains' convergence in the model. In this study, convergence diagnostics were carried out to evaluate the convergence of Markov chains using both visual inspection and additional diagnostics. The National Cardiovascular Disease Database-Acute Coronary Syndrome (NCVD-ACS) registry, which included 1248 female patients with ST-Elevation Myocardial Infarction (STEMI) between 2006 and 2013, was used for this study's analysis. The multivariate Bayesian model identified six significant variables: dyslipidaemia, myocardial infarction, smoking, renal disease, Killip class, and age group. The trace plots did not reveal any distinctive patterns based on these significant variables, and the model's MCMC mixing is typically good. While for the autocorrelation plots, mild autocorrelations for age group, Killip IV, as well as the intercept term in the model. Since there were only mild autocorrelations, no thinning is needed. Also, the Geweke diagnostic showed that the chain is divided into two windows containing a set fraction of the first and last iterations which produced standard Z-scores. The Geweke diagnostic did not provide evidence of non-convergence, as none of the Z-scores fell in the extreme tails of the N (0,1). In this study, a number of plots and additional diagnostic tools showed that the Markov chains have reached convergence, which is relevant to the general use of the MCMC approach.

Item Type:	Article
Keyword:	Bayesian; Convergence; Diagnostic; Markov chain; ST-Elevation Myocardial Infarction
Subjects:	R Medicine > RA Public aspects of medicine > RA1-1270 Public aspects of medicine > RA1-418.5 Medicine and the state > RA407-409.5 Health status indicators. Medical statistics and surveys R Medicine > RC Internal medicine > RC31-1245 Internal medicine > RC581-951 Specialties of internal medicine > RC666-701 Diseases of the circulatory (Cardiovascular) system
Department:	CENTRE > Preparation Centre for Science and Technology
Depositing User:	ABDULLAH BIN SABUDIN -
Date Deposited:	06 Feb 2025 13:50
Last Modified:	06 Feb 2025 13:50
URI:	https://eprints.ums.edu.my/id/eprint/42773

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