... estimation of population variance 总体方差估计 estimation of ratio 比率估计 estimation of sample size with proportions 比例抽样样本容量估计 ...
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比率估计法 method of ratio estimation ; Ratio estimation ; Ratio estimator
比率估计值的方差 variance of ratio estimate
组合比率估计 [统计] combined ratio estimate
比率估计抽样 ratio estimate sampling ; ratio estimation
分别比率估计值 separate ratio estimate
比率估计偏倚 [数] bias of ratio estimate
双比率估计量 double-ratio estimator
多元比率估计 multivariate ratio estimate
氡引起肺癌的比率估计范围为3 - 14%。
The proportion of lung cancers attributable to radon is estimated to range from 3 to 14%.
讨论多阶段抽样比率估计及其样本量选择的问题，给出了比率估计抽样均方误差的近似公式及其渐近无偏估计的公式。
We give the approximation formulas of the variance of the sample ratio estimator for a population mean and its asymptotically non-biased estimator in multi-stage sampling.
但是蔡先生和其他人口统计学家估计，真实的比率是接近1.5。
But Mr. Cai and other demographers estimate the real rate is closer to 1.5 children.
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