摘要
ByusingGARCHandEGARCHmodels,theauthorsexaminetherelationshipbetweenpricevolatilityandnewinformationflow,representedbytradingvolume,andpastinformationflow,representedbytheARCHeffect,intheShanghaiStockMarketforthethreedifferentperiodsfromJuly1998toDecember2002:thesoftperiod,thebullperiod,andthebearperiod.Theempiricalresultsshowthat:(1)thereexistsa'leverageeffect'inthestockmarket;thatis,negativenewshadagreaterimpactonstockpricevolatilitythandidpositivenewsinthesoftperiodandbearperiod,butinthebullperiodthe'leverageeffect'behavesdifferently；(2)thereisasignificantlypositiverelationshipbetweentradingvolumeandstockpricevolatility,andsucharelationshipisevenmoresignificantinthebearperiod;(3)itturnsoutthatinthethreeperiods,therelationshipsbetweenstockpricevolatilityandinformationflow,bothpastandnew,arenotthesame;thatis,inboththesoftandbullperiods,boththeARCHeffect,reflecting'pastinformationflow',andtradingvolume,reflecting'newinformationflow',explainpricevolatilitysimultaneously,butinthebearperiod,theARCHeffectissubstantiallyreduced.Thesefindingsprovidekeyevidenceforunderstanding,explaining,andtrackingthecharacteristicsofpricevolatilityandthechangingrulesofthestockmarketinChinamorecomprehensively.
出版日期
2004年02月12日（中国Betway体育网页登陆平台首次上网日期，不代表论文的发表时间）
