Macroeconomic Determinants of the Coffee Price Volatility in Ethiopia. Application of the Garch-Midas Model
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Master's Thesis from the year 2020 in the subject Economics - Statistics and Methods, grade: 24, Haramaya University, language: English, abstract: Application of GARCH type model is a key for modeling and forecasting volatility for high frequency data such as daily commodity price. Following the same framework, the objective of the present study is to apply the multiplicative GARCH-MIDAS model for daily exported coffee price as proxy of daily total coffee price of Ethiopia over the period of 1-1-2008 to 7-17-2018 with the purpose of fitting and forecasting coffee price returns volatility. The GARCH-MIDAS model decomposes the conditional variance as short-term component of GARCH (1,1) process, and long-term component, with monthly frequencies of macroeconomic variables. In this study exchange rate (nominal exchange rate), inflation rate (general inflation), interest rate (lending interest rate), fuel oil price (price of imported petroleum and petroleum production), total consumption and money supply (broad money) macroeconomic variables were employed through MIDAS specification using beta-weighting scheme to analyze impact of the variables on the long-term volatility component. For fitted ARMA (1,1) of coffee price return ARCH effect test on the residual from the mean model revealed the existence of time varying conditional variance for the selected mean model. A conditional variance model GARCH (1,1) was selected and used to model the conditional variance of coffee price return with Quasi Maximum Likelihood along with Bayesian estimation methods and both estimation procedures indicated the persistence of conditional variance observed even for small sample under Bayesian estimation framework. Asymmetry test show the insignificance of the asymmetric term, while Lundbergh and Terasvirta Lagrange Multiplier and the Li-Mak portmanteau test for the residual of GARCH model show the existence of time varying unconditional variance and made call for GARCH-MIDAS model. From
The author, Tekle Bobo Tolassa was born on 30 December 1990 from his father Bobo Tolassa and mother Melkitu Nemera in a village called Jirata in Diga District of East Wolega zone in Oromia, Ethiopia. He attended his elementary education from 1998 to 2005 at Muleta Elementary School and Junior Secondary School at Ifa Senior Secondary School from 2006-2007. Thereafter, he joined Nekemte Comprehensive Preparatory School and completed Preparatory education in 2009. After successfully passed the Ethiopian Higher Education Entrance Qualification Examination, he joined Haramaya University in 2010 and graduated in June 2012 with Bachelor of Science Degree in Statistics. After graduation, he was employed by Central Statistical Agency of Ethiopia (CSA) at Nekemte branch office as junior data collector in October 2013. After serving for six months, the author left CSA and was employed by Oromia Agricultural Research Institute (OARI) at Bore Agricultural Research Center (BOARC) as a Junior Researcher in June 2013. He worked in Crops Technology process as Biometrician/Statistician until he joined the School of Postgraduate Studies of Haramaya University in October 2018 to pursue his study leading to MSc degree in Statistics, Econometrics specialization. Now Mr. Tekle Bobo successfully completed his MSc programs and hold associated researcher position. Now Mr. Tekle bobo is serving Bore Agricultural Research Center on the socioeconomic Research team as Associated Researcher.
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