Comparison of Accuracy Properties of Point Estimators for the Ratio of Binomial Proportions with the Inverse-Direct Sampling Scheme

Abstract

We continue our investigation into the estimation of the ratio of Binomial proportions. We concentrate on point estimation and its accuracy properties. A problem of the point estimation for a ratio of two proportions using data from two independent Bernoulli samples is considered. In this article we mostly discuss the case when the first sample is obtained using the Inverse sampling scheme and the second one using the Direct Binomial sampling scheme. Our goal is to show that the normal approximations, which are relatively simple, for estimates of the ratio are reliable for the construction of point estimators with reliable accuracy properties. The main criterion of our judgment is the bias and mean squared error. The main accuracy characteristics of estimators corresponding to all possible combinations of sampling schemes are investigated by the Monte-Carlo method. Mean values and mean squared errors of point estimators are collected in tables, and some recommendations for the application of each estimators are presented.