本篇論文要探討的主題為何種總體或個體因素會影響投保人在壽險上的解約行為。由於壽險保單的解約行為會讓保險公司面臨現金流、聲譽、逆選擇等風險，進而影響公司營運。因此探討影響保單解約率之因素，進而準確估計保單的解約率為十分重要的議題。此外，不論投保人主動解約或是被動使保單失效均會對保險公司造成影響，因此本篇論文也將利用不同解約率的計算方式進行實證分析，研究是否不同計算方式的解約率會影響實證結果。本文使用NAIC (National Association of Insurance Commissioners)保險資料庫之年報資料，對2004-2014年間保險公司之經營狀況進行分析，驗證解約率實證中常用的三個假說：市場利率假說、緊急資金假說以及保單替換假說，選用之變數包含失業率、利率、保單替換率、高齡比等變數，並採用固定效果模型作為縱橫資料之迴歸模型，分別對不同計算方式所得之解約率進行迴歸分析，並比較彙整其結果。最後針對結果提出未來研究之建議。 / Insurance companies’ business will be influenced by surrender activities in several aspects, such as cash flow problem and inverse selection problem. Empirical researches show that both macroeconomic variables and microeconomic variables will influence surrender behaviors. Hence, this paper seeks to which kinds of macroeconomic variables will influence surrender activities and investigates whether using different ways to calculate surrender rate will cause different empirical results. All available US insurance company data, ranging from January 2004 to December 2014, are obtained from the annual statement in NAIC (National Association of Insurance Commissioners).We found some evidence supporting Emergency Fund Hypothesis and Interest Rate Hypothesis, but using different ways to calculate surrender rate may cause a little bias in conclusion. However, the relationship between surrender activities and macroeconomic variables supports insurance companies to understand and actively manage lapse/surrender risk.

壽險保單之解約行為的控管關係著保險公司對於未來現金流量的估計準確與否，過高的解約行為可使保險公司承受非預期的流動性風險和投資利潤減少等負面影響，故探討影響保單解約行為之因素為學術上和實務上皆相當重視的議題。本研究以台灣某家本土保險公司之保單資料為研究樣本，樣本資料包含解約與否以及各項保單契約特質之變數，並採用羅吉斯回歸為分析模型進行實證研究。本研究針對不同種類保單商品分別進行實證分析和比較彙整分析結果，並根據實證結果給予保險公司未來發行新保單時，該如何透過契約內容的修正以有效降低解約行為之建議。

摘要 衡量壽險公司利率風險的初步作法是估算保單的存續期間。保單的存續期間因現金流量模式的不同與一般債券的存續期間有很大的差異。壽險保單未來不只會產生現金流出 （給付和費用），還會有現金流入（保費），其淨現金流量因而有可能變號，所以壽險保單的存續期問可能小於○，也可能大於到期日，甚至還可能因為準備金接近○的關係而有很大的數值。此外，保單的存續期間不太受死亡率下降的影響，解約率升高通常會使存續期問的數值降低，而佣金的平準化則會使原本正的存續期問變小。從壽險公司銷售保單組合可能的結果（平穩、成長、衰退等三種型態）來分析負債存續期間，由其結果可知一個新創立或成長型的壽險公司其所面臨利率風險的衝擊要大於一個處於平穩型或衰退型的壽險公司。 關鍵字：存續期間、利率風險、淨現金流量、壽險保單、準備金 / Abstract Estimating the duration of the life insurance policy is the first step in measuring the interest rate risk of the life insurance company. Life insurance policy's duration is quite different from bond's due to the difference in the pattern of cash flows. Life insurance policies generate not only cash outflows as payments to policyholders from insurance companies but also cash inflows as premiums from policyholders to insurers. Furthermore, the net cash flow usually turns from inflow to outflow as time goes by. The duration of the life insurance policy therefore could be negative or longer than the maturity of the policy. It could even be huge if its reserve is close to zero. Besides, the mortality rate does not have a significant impact on policy duration; early surrenders of policies would reduce policy duration in general; and leveling commission rate would make positive duration smaller. Findings concluding from analyzing the likely results, referring to the steadying, growing and declining modes, of insurance portfolios offered by life insurance companies for analyzing their liability duration, indicate that the interest rate risk exposure by a start-up life insurance company or a growing life insurance company is greater than a life insurance company that is at a steadying or declining phase. Keywords: duration, interest rate risk, net cash flow, life insurance policies, reserve.