The polar confidence curve for a ratio
基于Fieller方法构建比率的极坐标置信图，展示置信集的内在属性，帮助判断置信集是否无信息或不连通。
Based on Fieller’s method for the estimation of a confidence set for a ratio, I construct a polar plot of the test statistics for all angles associated with the ratio. This polar confidence plot clarifies and systematizes the inherent properties of the confidence set for ratios and, in particular, determines how the confidence set may be uninformative or disconnected.