Theoretical and Applied Economics
No. 5 / 2012 (570)
Using Garch-in-Mean Model to Investigate Volatility and Persistence at Different Frequencies for Bucharest Stock Exchange during 1997-2012
Bucharest Academy of Economic Studies
Ecaterina Oana SLĂVESCU
Bucharest Academy of Economic Studies
Abstract. In our paper we use data mining to compare the volatility structure of high (daily) and low (weekly, monthly) frequencies for seven Romanian companies traded on Bucharest Stock Exchange and three market indices, during 1997-2012. For each of the 10 time series and three frequencies we fit a GARCH-in-mean model and we find that persistency is more present in the daily returns as compared with the weekly and monthly series. On the other hand, the GARCH-in-mean failed to confirm (on our data) the theoretical hypothesis that an increase in volatility leads to a rise in future returns, mainly because the variance coefficient from the mean equation of the model was not statistically significant for most of the time series analyzed and on most of the frequencies. The diagnosis that we ran in order the verify the goodness of fit for the model showed that GARCH-in-mean was well fitted on the weekly and monthly time series but behaved less well on the daily time series.
Contents
Optimal Labor Contracts with Asymmetric Information and More than Two Types of Agent
Inflation Targeting in the Romanian Banking Brushwood
Oligarchy versus Democracy and Regulation versus Deregulation under the Globalization Effect
Using Garch-in-Mean Model to Investigate Volatility and Persistence at Different Frequencies for Bucharest Stock Exchange during 1997-2012
Preparation of Financial Statements for Sme’s in Romania. Interest for Cash-Flow Statement
The Biblical Matrix of Economics
The Sustainable Development Model
Comportamentul financiar al populaţiei în timpul crizei
Education and Crisis
The Post-Crisis Healthcare System: Effects of the Economic Crisis in Romania
Business Incubators – Favorable Environment for Small and Medium Enterprises Development
Procedural and Systematic Crisis Approach and Crisis Management