死亡率预测是人口预测、长寿风险度量以及寿险公司产品定价和风险管理的基础。在死亡率预测模型中,Lee—Carter模型被广泛采用,但关于Lee—Carter模型的理论分布函数、期望和方差等分布特征,并没有专门的研究。本文在文献研究的基础上,对Lee—Carter模型进行了完整的理论研究,给出了完整的Lee-Carter模型理论分布和区间预测表达式,为相关研究提供了可靠的理论依据。同时,对传统的Lee—Carter预测区间估计方法和文中给出的区间预测估计方法进行了对比研究,发现使用传统Lee—Carter预测区间估计方法得到的预测区间较窄,对长寿风险存在低估,在预测时间较短时,这种低估更严重。
Mortality prediction is the basement of the population forecast, life insurance product pricing,longevity risk measurement and management. In the mortality prediction model, Lee-Carter model is widely used, but for the Lee-Carter model, there is no special study on the theoretical distribution function, the expectation and variance of the distribution features. Therefore, the paper makes a relative complete research on the model of Lee-Carter theory, and Lee-Carter model distribution flmction and interval prediction expressions derived in this paper provide a reliable theoretical basis for correlation study. Besides, the prediction interval estimated by traditional method is narrower comparing with the Lee-Carter prediction interval estimated by theoretical method, which means the longevity risk is undervalued. The underestimation become more serious in short-term prediction of longevity risk.