本研究利用電話調查資料，針對個案無反應中逐年惡化的拒訪議題進行分析，試圖探討曾經直接或間接拒訪的受訪者之追訪效益，並比較初始接受訪問者與追訪成功者之間的差異性。研究結果顯示，運用基本的策略對拒訪者的追訪，所護得的成效不高；而且在這樣策略下的追訪成功者，不論是在基本人口結構，抑或是對社會、經濟及政治面向的認知態度上，都與原始接受訪問者不具有統計上的顯著差異。此外，本研究也針對影響類拒訪者能被成功追訪的因素進行分析，結果顯示：1.老經驗的訪員對追訪效益的貢獻較高；2.撥打次數過多，無助於追訪成功，但與類拒訪者的接觸時間較長，卻有助於成功地說服接受訪問；3.都市化程度愈高，追訪的成效則愈高。

This paper analyzes nonresponse due to refusals in a telephone survey, and examines the effectiveness of attempts to persuade those who directly or indirectly refused to participate in the survey. This paper also compare the differences between those who agreed to participate in the survey from the beginning and those who initially refused, but were later persuaded to participate. Results indicate that there are no significant differences between them in demographic characteristics, nor significant differences in attitudes toward social, political, and economic issues. In addition, the efficacy of attempts to persuade those who initially refuse is unremarkable. The results of logistic regression analysis of refusal conversion show: (1) The contribution of experienced interviewers in refusal conversion is much greater; (2) Interview completion is less related to call attempts, but it's related to a longer contact; (3) Urbanization is an add-on factor for refusal conversion.