Tarter M E, Cooper R C, Freeman W R
Environ Health Perspect. 1983 Nov;53:79-89. doi: 10.1289/ehp.835379.
Five statistical procedures were used to partial the correlation between waterborne asbestos and digestive site cancer for the putative effects of population density. These include: analysis based on a data subset with roughly homogeneous population density; standard residual analysis (partial correlation); conditional probability integral transformation; analysis based upon ranked data, and use of logarithmic transformation. Nonparametric regression graphical techniques are applied to examine the nature or shape of the asbestos-cancer dose-response curve. Evidence is presented that suggests that there is considerable difference between analyses involving nonhigh-density tracts and non-San Francisco tracts. Evidence is also presented that the modal-type nonparametric regression curve forks or bifurcates when adjustment is made for population density.
采用了五种统计方法来分离水源性石棉与消化器官癌症之间的相关性，以排除人口密度的假定影响。这些方法包括：基于人口密度大致均匀的数据子集进行分析；标准残差分析（偏相关）；条件概率积分变换；基于排序数据的分析以及对数变换的运用。应用非参数回归图形技术来检验石棉-癌症剂量反应曲线的性质或形状。有证据表明，涉及非高密度区域和非旧金山区域的分析之间存在相当大的差异。还有证据表明，在对人口密度进行调整时，模态型非参数回归曲线会分叉。
