例句與造句

1. We research the stability of the three - factor model by using chow test and research the coefficient stationary by using unit root test , and forecast the coefficient of the model using arma 、 garch model . the results show that the model is instability in the long run , most coefficient is non - stationary , and we can preferably forecast the coefficient by using the arma 、 garch model . in the process of designing strategic investment portfolios and the strategic risk budgeting prevailing in resently which in order to control investment risk , the investors generally structure their portfolios in different industries
   模型回歸系數(shù)是測度投資對象系統(tǒng)風(fēng)險的重要指標(biāo),我們利用chow檢驗對證券收益三因素模型結(jié)構(gòu)的穩(wěn)定性進(jìn)行了分析研究,用adf檢驗對模型的三個回歸系數(shù)的穩(wěn)定性進(jìn)行了實證分析,采用arma和garch模型對回歸系數(shù)的預(yù)測能力進(jìn)行了研究,結(jié)果表明組合三因素模型結(jié)構(gòu)不穩(wěn)定,但短期比長期結(jié)構(gòu)穩(wěn)定性要高;大部分組合回歸系數(shù)時序穩(wěn)定性較差,同時arma和garch模型對每個回歸系數(shù)時間序列進(jìn)行預(yù)測顯示有較好的預(yù)測能力。
2. It's difficult to find chow test in a sentence. 用chow test造句挺難的