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One problem was what statisticians call selection bias. 一个问题被统计学家称作选择偏见。
Heckman, J.J. (1979), Sample selection bias as a specification error, Econometrica, 47, 153-161. 样本选择偏差，一看就知道是个很重要的问题嘛，排名第五，不算亏待。
"New studies, however, have shown substantial unadjusted selection bias in previous cohort studies. 不过，新的研究显示，在这些世代研究中有明显的选样误差。
The eligibility criteria determine the study population but are a potential source of selection bias that can affect generalizability of the results. 这些研究需要提供生存优势的足够水平的证据，或者用于改变临床实践的任何治疗的临床受益。
Who attacks whom?why they all have selective BIAS,neglecting truth? 谁伤害了谁?为什么他们都选择性的忽视事实?
The findings are subject to selection bias and confounding, which will have been minimised but not eliminated by propensity score matching. 该发现是受选择偏倚和混杂设计的影响，这些可以通过倾向评分匹配最大限度的降低但不能消除。
But who attack whom？ Why they all habe selective BIAS, neglecting truth? 谁在攻击谁？为什么他们都选择性的忽视事实？
But who attacks shom?why they all have selective BIAS,neglecting truth? 谁在攻击谁?为什么他们都选择性地忽视事实?
But who atacks whom? Why they all have selective BIAS, neglecting truth? 谁在攻击谁？为什么他们都选择性地忽视事实？
But who attacks whom? Why they all have selective BIAS, neglecting truth? 谁在攻击谁？为什么他们都选择性的忽视事实？
But who attacks whom? Why they all have selective bias , neglecting truth? 谁在攻击谁？为什么他们都选择性的忽略事实？
But who attacks whom?Why they al have selective BIAS,neglecting truth? 谁在攻击谁？为什么他们都在选择性的忽视事实？
But who attacks whom?Why they all have selective BIAS,neglecting truth? 谁在攻击谁?为什么他们都选择性的忽视事实?
Like customer information, unemployment data are riddled with potential selection biases because they're taken only from the ranks of people who choose to work and not from the ones who don't. 由于失业数据是从那些想工作的人群而不是从那些不想工作的人群中获得的，因此，与客户信息一样，失业数据受潜在的选择偏差所迷惑。
That shop has a fine selection of cakes. 那家商店有各种精美的糕点供我们选择。
That store has a good selection of furniture. 那家店有很多家具可供挑选。
The selection was weighted against me. 那次选拔对我不利55。
She helped to select a dress for Ruth. 她帮着给露丝选了一件衣裳。
Causal Inference in the Models with Hidden Variables and Selection Bias 含隐变量和选择偏差的图模型中的因果推断
Dealing with Selection Bias in Administrative Health Care Databases by 如何处理卫生管理数据库的样板选择偏误

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