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garch模型與波動(dòng)性建模-資料下載頁(yè)

2025-05-10 14:03本頁(yè)面
  

【正文】 ? ? ? ????????? ???? 221110 )(,)(,1)(, ??????? qtqttttq XyXyz ??? ? ?? ?? )(tt zh記 則 ??????? ???樣本對(duì)數(shù)似然函數(shù)為: ???????????????Tt tttTtttttTthXyhTXyfL12111)(21)l n (21)2l n (2)。,(ln)(????????? ??????? TttTtttt sXyfL111 )()。,(ln)( ????? ??????? ?)。,(ln)( 1ttttXyfs?????????????????????????tttttttt hhXyXyhh222 )()(121)ln (21?????? ??????02)( 2 tttt uXXy???????????? ???? ????)(21???tqjjtjtjtzXuh ??????? ? )。,(ln)( 1ttttXyfs????????????????? ??? ?? ??0/)()(22)(122ttttqjjtjtjttt huXzXuhhu??所以, 令 ?????TttsL1)()( ???=0 此方程可由數(shù)值計(jì)算方法求解,在實(shí)際應(yīng)用中,可借助軟件包進(jìn)行計(jì)算。
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