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The importance of principal components in studying mineral prices using vector autoregressive models: Evidence from the Brazilian economy

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  • de Souza Ramser, Claudia Aline
  • Souza, Adriano Mendonça
  • Souza, Francisca Mendonça
  • da Veiga, Claudimar Pereira
  • da Silva, Wesley Vieira

Abstract

This study examines the impact of the main Brazilian mineral commodity prices negotiated in trade balance using vector autoregressive models (VAR) in the Brazilian economy in a short-term period. VAR models were applied to the full original data and then to the data dimensionality reduced by principal components denoted by PC-VAR (principal component - vector autoregressive). In the study cases, Cholesky decomposition impulse response and variance decomposition were performed and compared in terms of short run co-movements to identify the most effective model. The applied PC-VAR methodology led to a significant reduction of variables, and similar co-movements were obtained in the short-term period when an impulse response was applied and compared to an unrestricted vector autoregressive. The proposed method also identified the most important variables that affect the other variables in the Brazilian economy and have the same co-movements.

Suggested Citation

  • de Souza Ramser, Claudia Aline & Souza, Adriano Mendonça & Souza, Francisca Mendonça & da Veiga, Claudimar Pereira & da Silva, Wesley Vieira, 2019. "The importance of principal components in studying mineral prices using vector autoregressive models: Evidence from the Brazilian economy," Resources Policy, Elsevier, vol. 62(C), pages 9-21.
    • Handle: RePEc:eee:jrpoli:v:62:y:2019:i:c:p:9-21
    DOI: 10.1016/j.resourpol.2019.03.001
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