Bayesian Inference for Seasonal ARMA Models

Document Type : Original Article

Authors

Cairo University, Egypt

Abstract

An essential ingredient of any time series anatysis is the estimation of the modcl parameters. The main objective of this paper is to develop a convenient Rayesian technique for estimation which can be used to analyze ‘seasonal autoregressive moving average processes. The foundation of the proposed approach is to approximate the conditional likelihood by a normal-gamma distribution on the parameter space; Based on the approximated conditional likelihood function, the marginal posterior distribution of the coefficients of the model is approximated by a t distribu- tion, and the marginal posterior distribution of the model precision is approximated by a gamma distribution. The proposed technique is illustrated by some numerical examples.