西安电子科技大学学报(社会科学版)
西安電子科技大學學報(社會科學版)
서안전자과기대학학보(사회과학판)
JORUNAL OF XIDIAN UNIVERSITY(SOCIAL SCIENCES EDITION)
2014年
4期
55-63
,共9页
结构突变%GARCH%波动预测%股市%SPA检验
結構突變%GARCH%波動預測%股市%SPA檢驗
결구돌변%GARCH%파동예측%고시%SPA검험
Structural Breaks%GARCH%Volatility Forecasting%Stock market%SPA test
考察波动的结构突变性对模型估计和预测能力的影响,并通过SPA检验评估几种GARCH模型的预测能力优劣。研究发现,我国股市收益率的波动在样本期内发生了4次结构突变,波动存在着伪持续现象,且这种突变影响了模型的预测能力;SPA 检验表明,短期预测上,经结构突变修正的 GARCH 模型具有较高的预测能力,验证了结构突变对波动预测的重要性;长期预测上,基于滚动时间窗口下的 GARCH 模型具有较好的预测能力,通过调整时间窗口的方法来消除结构突变的影响有助于提升模型预测能力。
攷察波動的結構突變性對模型估計和預測能力的影響,併通過SPA檢驗評估幾種GARCH模型的預測能力優劣。研究髮現,我國股市收益率的波動在樣本期內髮生瞭4次結構突變,波動存在著偽持續現象,且這種突變影響瞭模型的預測能力;SPA 檢驗錶明,短期預測上,經結構突變脩正的 GARCH 模型具有較高的預測能力,驗證瞭結構突變對波動預測的重要性;長期預測上,基于滾動時間窗口下的 GARCH 模型具有較好的預測能力,通過調整時間窗口的方法來消除結構突變的影響有助于提升模型預測能力。
고찰파동적결구돌변성대모형고계화예측능력적영향,병통과SPA검험평고궤충GARCH모형적예측능력우렬。연구발현,아국고시수익솔적파동재양본기내발생료4차결구돌변,파동존재착위지속현상,차저충돌변영향료모형적예측능력;SPA 검험표명,단기예측상,경결구돌변수정적 GARCH 모형구유교고적예측능력,험증료결구돌변대파동예측적중요성;장기예측상,기우곤동시간창구하적 GARCH 모형구유교호적예측능력,통과조정시간창구적방법래소제결구돌변적영향유조우제승모형예측능력。
The author takes account into the influence of the structural breaks into the GARCH model and the forecasting of the volatility, uses the SPA test to evaluate the ability of prediction of several GARCH models. The research shows the evidence of structural breaks in the unconditional variance of the stock returns series over the period and the high levels of persistence in the parameter estimates of the GARCH(1,1) model across the sub-samples. The impact of structural breaks on the accuracy of volatility forecasts has largely been ignored in previous research. The SPA test shows that, in the short-run volatility forecasting, the GARCH model with structural breaks performs best, whereas the GARCH model with rolling windows performs well in the long term prediction. By adjusting the estimation window, it can eliminate the influence of structural breaks and help improve prediction ability.