title: A graphical analysis of the interrelationships among waterborne asbestos, digestive system cancer and population density.
abstract: 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.
mesh_terms: D001194:Asbestos / Q000009:adverse effects*; D002140:California; D004067:Digestive System Neoplasms / Q000453:epidemiology*; D006801:Humans; D011156:Population Density; D012306:Risk; D013223:Statistics as Topic; D014881:Water Supply
chemical_list: D001194:Asbestos