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 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。
youdao
Microsoft hotly contested this, and claimed Mr Weadock's sampling was biased.
BBC: USA versus Microsoft: The fifth week
应用推荐
模块上移
模块下移
不移动