• 沒有找到結果。

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第五章、結論與建議

第一節、 結論

本研究使用貝氏方法估計 Huang(2004)的隨機作答模式之參數,能解決當

1 2

( ,   ˆ ˆ )

的值較極端 MLE ˆ

超過 0 或 1,而產生不合理估計值的情形,使用貝氏方 法估計能幫助社會統計學家得到合理的估計值,以作社會學相關參數的推論之用。

其次,本研究驗證當事前資訊(prior information)提供

的事前期望值介於 0.05~0.33 時,貝氏估計量

*的估計效率高於 MLE ˆ

第二節、 建議

本研究建議未來可再進行的研究,有兩大方向,分別為「貝氏估計方法」與

「再考慮非敏感性的群體有不完全誠實作答之情況」。以下為「貝氏估計方法」

可在著眼的項目:

1. 採用本研究的假設,討論當

的事前期望值大於 0.33 時,貝氏估計量

*

MLE ˆ

效率之高低。

2. 若當

的事前分配不同於本研究之假設時,如:

不獨立時或是其邊際

事前分配不為 beta 分配時,則貝氏估計量與貝氏風險為何?而貝氏估計量

*

的估計效率與 MLE ˆ

比較的結果又為何?

3. 直接假設

的事前分配從

下手推導

的事後分配,其式子由

n r

1+1個機 率密度函數所組成,且貝氏估計量由

n r

1+1個 beta 分配的期望值相加,當樣

本數

n

很大時,計算就非常耗時。可再研究其他的方法,以求得簡化之近似

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式。

Warner(1965)在其研究中假設使用直接詢問法時,不屬於敏感性群體的受訪 者會有不誠實作答的情況,但在其隨機作答模式中卻沒有考慮,Huang(2004)亦 無討論。若要再考慮非敏感性的群體有不完全誠實作答之情況,且想要對其不誠

實作答率b做估計時,則可研究新的隨機作答模式或是改良既有之隨機作答模式,

以同時取得、與b之估計量。

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