The Use of Statistics to Examine the Association Between Fluoride in Drinking Water and Cancer Death Rates
讨论了统计显著性检验的基础，指出在检验饮用水中氟化物与癌症死亡率关联时，应考虑城市间变异，并评述了两项相关研究的方法差异。
"The basis of statistical tests of significance of association between fluoride level in drinking water and cancer death rates is discussed. Reference is made to two reported studies in each of which cancer death rates of a number of [U.S.] cities were used. It is argued that between city variation should be taken into account when performing tests of significance. In one of the two studies this was done informally; in the other between city variation was ignored."