In this paper, the bias of the ratio estimator and the estimate of mean square errors of this estimator with known numerator have been compared and discussed.
给出了分子已知情况下比率估计量的偏差和均方误差以及均方误差的估计，并对两类比率估计量进行了比较。
2
As a result, the influence of signal light and bias current to the power and extinction ratio of converted light is studied in detail.
从而研究了待转换的信号光及偏置电流对转换光功率和消光比的影响。
3
For the ratio estimate in two-stage sampling, the bias and mean square errors(MES) of the estimater value have been obtained, and the estimater value of the MSE has been given.