a Centre for Population Studies , London.
Popul Stud (Camb). 1979 Mar;33(1):79-100. doi: 10.1080/00324728.1979.10412778.
Summary Brass's model life table system, which is a two parameter system based on the logit transformation of survivorship values, has been widely and successfully used to describe age patterns of mortality in many populations. As more reliable information has become available for populations with mortality patterns which differ in important ways from the assumed standard pattern of mortality, a more flexible model system is needed. This paper shows how Brass's system can be expanded into a four-parameter model, and evaluates the performance of the new system by examining how well it can fit observed life table data.
布拉斯生命表模型系统是一种基于生存值对数变换的双参数系统，已被广泛成功地应用于描述许多种群的死亡率年龄模式。随着更多可靠的信息可用于死亡率模式与假设的标准死亡率模式在重要方面存在差异的种群，需要一种更灵活的模型系统。本文展示了如何将 Brass 的系统扩展为四参数模型，并通过检查其对观察生命表数据的拟合程度来评估新系统的性能。
