||Graphical Analysis of the Interrelationships among Waterborne Asbestos, Digestive System Cancer and Population Density.
Tarter, M. E. ;
Cooper, R. C. ;
Freeman, W. R. ;
||California Univ., Berkeley.;Health Effects Research Lab., Research Triangle Park, NC.;National Cancer Inst., Bethesda, MD.
||EPA-68-03-3130, PHS-CA-28142; EPA/600/J-83/265;
Malignant neoplasms ;
||Some EPA libraries have a fiche copy filed under the call number shown.
Five statistical procedures were used to partial the correlation between water-borne 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 the logarithmic transformation. Monparametric regression graphical techniques are applied to examine the nature of shape of the asbestos-cancer dose-response curve. Evidence is presented which suggests that there is considerable difference between analyses involving non-high 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.