Analysis of TB Case Counts in Southwest Ethiopia Using Bayesian Hierarchical Approach of the Latent Gaussian Model
American Journal of Bioscience and Bioengineering
Volume 8, Issue 1, February 2020, Pages: 7-16
Received: Jan. 10, 2020; Accepted: Feb. 26, 2020; Published: May 19, 2020
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Endale Alemayehu, Department of Statistics, College of Natural Sciences, Ambo University, Ambo, Ethiopia
Reta Habtamu, Department of Statistics, College of Natural Sciences, Jimma University, Jimma, Ethiopia
Akalu Banbeta, Department of Statistics, College of Natural Sciences, Jimma University, Jimma, Ethiopia
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Introduction: Tuberculosis is the long-lasting infectious disease caused by bacteria called Mycobacterium tuberculosis. Globally, in 2016 alone, approximately 10.4 million new cases have occurred. Africa has shared around 25% of the incidence and specifically in Ethiopia around 82 thousand was caught by Tuberculosis. Methods: The study has been conducted in, south west Ethiopia, Jimma zone of entire districts and the data is basically secondary which is obtained from Jimma zone health office. The counts of Tuberculosis case counts have been analyzed with factors like gender, HIV co-infection, Population density and age of patients. The Integrated Nested Laplace Approximation (INLA) method of Bayesian approach which is fast, deterministic and promising alternative to MCMC method was used to determine posterior marginal of the parameters of interest. Results: The Latent Gaussian Model (LGM) of Poisson distributional assumption of Tuberculosis cases that includes both fixed and random effects with penalized complexity priors appeared to be the best model to fit the data based on the Watanabe Akaike Information Criteria and other supportive criteria. Using Kullback-Leibler Divergence criteria, the under-used simplified Laplace approximation indicated that posterior marginal was well approximated by normal distribution. The predictive value of the best model is not far deviated from the actual data based on the Conditional Predictive Ordinate and the probability integral transform. Conclusions: All the variables were significant under this model and the posterior marginal was well approximated by standard Gaussian. The PIT indicated that predictive distribution was less affected by outliers and the model was reasonably well.
Tuberculosis, Bayesian Approach, LGM, INLA
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Endale Alemayehu, Reta Habtamu, Akalu Banbeta, Analysis of TB Case Counts in Southwest Ethiopia Using Bayesian Hierarchical Approach of the Latent Gaussian Model, American Journal of Bioscience and Bioengineering. Vol. 8, No. 1, 2020, pp. 7-16. doi: 10.11648/
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