One problem was what statisticians call selection bias.
一个问题被统计学家称作选择偏见。
Self-selection bias and sampling bias are also discussed at the end of the paper.
与此相关的自选择偏差和抽样偏差问题也在文中进行了讨论。
One way of investigating this is — to get around the selection bias — is to try to look at all countries.
为了避免选择性偏差，研究方法之一是，研究所有的国家。
No baseline data were found to be related to the prognosis due to a small sample size and selection bias.
因小样本及选择偏倚，无基线资料与预后相关。
Third, selection bias might be a concern as an earthquake may not be a perfect instrument for randomization.
第三，应该注意到选择的偏差，因为地震可能不是一个随机选择的完美工具。
Before buying a sofa for the office, however, it might be wise to consider the possibility of selection bias.
在办公室添置沙发之前，最好还是先考虑一下选择性偏见的可能性。
But both the selection bias and regular-phone-use definition might be expected to mask any adverse effect of phones.
但是选择偏见和常规手机使用的定义可能会掩盖了手机的众多影响。
Besides, we find no significant self-selection bias in the wage equations, which suggests poor job mobility in our samples.
我们还发现，工资方程并不存在显著的自我选择偏误，这表现出样本中职工的工作流动性还不高。
One limitation of this report is the lack of randomization for any observational design that can mislead for selection bias;
报告的一个局限性就是观察设计没有随机化，可能误导为选择偏倚。
The question was whether this result was subject to the same selection bias as that which strangely showed a reduced risk among regular users.
但问题是，这一结果是否与之前经常使用手机的用户患病几率降低的结论一致呢？
In order to remove some selection bias, he's even hired someone to be (at least some of the time) 'Chief Nag' to get results out of resistant responders.
为了消除一些选择偏见，(至少在一段时间内)他甚至聘请专人担任‘首席挑剔执行官’，以便从存在抵触情绪的反馈者身上得到结果。
If earthquakes do not strike randomly, non-victims might not be perfectly comparable to victims, and selection bias might have affected the results.
第三，应该注意到选择的偏差，因为地震可能不是一个随机选择的完美工具。
The researchers acknowledge study limitations, including possible selection bias, misclassification of race and inaccurate responses to questionnaires.
研究人员承认研究也有一定局限性，包括可能的选择偏倚、种族误判和不准确的调查问卷等。
The researchers insist that this lower mortality rate is not the result of the breast augmentation procedure itself, but rather of a double selection bias.
研究人员认为，这一较低的死亡率不是隆胸本身的结果，而是由于双重选择偏倚。
The known correlation of high birth order with low SES suggests that selection bias related to SES may be responsible for the association between birth order and NHL.
低SES与出生次序靠后之间的已知相关性表明SES相关的选择偏差可能影响出生次序和NHL患病风险之间的相关性。
Studies that tried to track how chain letters propagate by email suffered from selection bias because they included only posts that had been "fossilized" on newsgroup archives.
那些试图追踪通过邮件传播的连锁信件受到选择性偏差的干扰，因为他们只包括了那些新闻组档案里过时的帖子。
The study also finds that unobserved effects, sample selection bias and measurement errors play important role on results, and OLS really underestimates yield of schooling.
非观测效应，以及样本选择偏差和测量误差所引发的内生性问题对结果的影响很大，导致普通最小二乘法低估了我国的教育收益率。
Conclusion The principles and methods for observational studies should be followed to reduce information bias, selection bias and confounding bias in statistical analysis of hospital data.
结论在对医院资料进行统计分析时，应遵循观察性研究的原则和方法，以避免可能存在的信息偏倚、选择偏倚和混杂偏倚。
As the authors state in their final sentence: “…further studies with large study populations, where the potential for misclassification of exposure and selection bias is minimized, are warranted.”
研究人员在报告中也表示：“我们正在准备更大规模、更进一步的调查研究，从而尽量避免错误归类的现象和选择上的偏误。”
Weighted: For a dataset that has no duplicates, bias the selection toward the front of the list.
加权：对于一个没有重复的数据集，倾向于列表的前面的选择。
Primary objective to avoid selection and publication bias, systematic reviewers should employ a broad range of search techniques and make efforts to locate unpublished studies.
目的为避免选择和发表偏倚，系统评价者应采用多种查询技术，并尽力获得未发表的研究。
The methodological quality of the eligible trial was assessed independently by each author for the degree selection, performance, attrition and detection bias.
收入的各个研究之品质，是由各作者独自依个案挑选、临床表现、耗损率和侦测偏差的程度来评估。
Proper selection of dithering amplitude and frequency of RLG has a direct influence on the effect of dithering bias.
抖动参数的正确选择直接影响抖动偏频效果。
Because there are so many high quality articles to choose from, selection of the "5 most important" articles must reflect observer bias.
正是有了如此之多的高质量的文章供选择，这“5最”文章的挑选必须体现出评论者的特点。
In parallel basis selection algorithms of sparse signal representation, there will be serious bias in amplitude estimation when frequency is not in grid.
在稀疏信号表示的并行选取字典算法中，当频率不在栅格点上时，对应的幅度估计可能会有很大的偏差。
In parallel basis selection algorithms of sparse signal representation, there will be serious bias in amplitude estimation when frequency is not in grid.
在稀疏信号表示的并行选取字典算法中，当频率不在栅格点上时，对应的幅度估计可能会有很大的偏差。
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