有歧视性抽样 sampling biased; sampling, biased 分段文件 segment file; segmental file .
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biased sampling 偏性抽样 ; [数] 有偏抽样 ; 样本偏差
length biased sampling [数] 长度偏倚抽样
length-biased sampling 长度偏倚 ; 持续期间偏差抽样
biased sampling method 偏性抽样法
common biased sampling 通有偏取样 ; 普通有偏取样
biased random sampling 基于偏好的随机抽样
biased sampling models 有偏模型
density biased sampling 密度偏差抽样
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.
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。
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Microsoft hotly contested this, and claimed Mr Weadock's sampling was biased.
BBC: USA versus Microsoft: The fifth week
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