• 沒有找到結果。

第四章 結論與建議

第二節 研究限制

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測行為,其最主要的原因有三個:

每個債券交易者所擁有的利率行為方程式中,

(1) 來自於擴散項(diffusion term)的係數,也就是瞬間變量的標準差。

(2) 漂移項(drift term)的係數,也就是利率的反轉速度。

(3) 一開始在第零期的初始利率。

上述三個影響因子的選取,最後皆會影響債券真實價格的權重,

也間接影響了公開市場訊息影響的權重,並且比較這兩者的權重大小,

從而得知,債券市場的交易者有無從眾行為的現象。換句話說,在本 論文研究發現到,在債券市場上,交易者欲利用資訊來決定上述三個 外生變數的選取,即為債券市場是否有從眾行為產生的最主要因素。

第二節 研究限制

現今一般利率模型眾多,若是選用較概化的利率模型,雖然可以 較準確描述現行的利率期間結構與利率的波動度期間結構,卻會帶來 過於繁複的計算過程,並且難以比較出最後債券的市場價格的決定因 素會來自於哪種交易類型的交易者,為了能方便與 Keynes 選美競爭 理論模型作結合,故在此選用較簡化的單因子利率模型(HO-Lee(1986) 利率模型)來探討研究,考慮受到資訊不對稱的影響下,嘗試在債券 市場中找出影響市場價格的因素,並探討債券市場有無從眾行為的現 象發生。

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