Manton K G, Stallard E
Demography. 1981 May;18(2):217-30.
A method of analyzing mortality rates in heterogeneous populations is presented. This method, appropriate for the investigation of mortality rates in small geographic areas (e.g., counties) where the forces of mobility operate to selectively "package" person, is applied to the determination of whether a spatial west-east gradient in cancer mortality rates existed in North Carolina over the period 1970 to 1975. A significant gradient (as well as a significant temporal trend) is determined to exist in the data, though only for particular race, age and sex-specific demographic groups. Several alternate hypotheses are presented to explain the existence of the spatial gradient in these particular demographic groups.
本文提出了一种分析异质人群死亡率的方法。这种方法适用于调查小地理区域（如县）的死亡率，在这些区域，流动因素会有选择地“组合”人群。该方法被用于确定1970年至1975年期间北卡罗来纳州癌症死亡率是否存在从西到东的空间梯度。数据显示存在显著的梯度（以及显著的时间趋势），不过仅针对特定种族、年龄和性别特定的人口群体。本文还提出了几个替代假设来解释这些特定人口群体中空间梯度的存在。
