Bayesian Estimation of Simultaneous Equation Models with Outliers and Multicollinearity Problem

Authors

  • Oluwadare O. Ojo Department of Statistics, Federal University of Technology, Akure, Nigeria

Keywords:

Bayesian, multicollinearity, outliers, Monte Carlo, Simultaneous equation model

Abstract

Outliers and multicollinearity are problems in the analysis of Simultaneous Equation Model (SEM) especially in applied research. They can lead to bias or inefficiency estimators. This study employed a Bayesian technique for estimation of SEM that is characterized by both multicollinearity and outliers. Monte Carlo experiment was applied while the data sets with specified outliers and multicollinearity were simulated for the SEM. The estimates of Bayesian and classical methods namely: two stage Least Squares (2SLS), Three Stage Least Squares (3SLS), Limited Information Maximum Likelihood (LIML) and Ordinary Least Squares (OLS) in simultaneous equation model were then compared. The criteria used for comparison were the Mean Square Error (MSE) and Absolute Bias (ABIAS). The Bayesian method of estimation outperformed classical methods in terms of MSE and ABIAS. However, the classical method has the same performance with Bayesian method when there are no outliers and multicollinearity in the simultaneous equation model. Hence, Bayesian method of estimation is preferred than classical method when there is problem of outlier and multicollinearity in a just identified simultaneous equation model.

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Published

2024-05-20 — Updated on 2024-05-24

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How to Cite

Ojo, O. O. (2024). Bayesian Estimation of Simultaneous Equation Models with Outliers and Multicollinearity Problem. Zimbabwe Journal of Science and Technology, 18(1), 34–42. Retrieved from https://journals.nust.ac.zw/index.php/zjst/article/view/197 (Original work published May 20, 2024)