大样本统计方法是指研究样本大小n趋于无限时,统计量和相应的统计方法的极限性质(又称渐近性质),并据以构造具有特定极限性质的统计方法。是一统计学术语。 一般数量大于等于30份的样本,我们称为大样本。
在应用核估计量时,若遇到 大样本 ( large sample )或者高维度资料(high dimensional data) ,则其计算量的负担非常大。
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We also estimate the nitrogen abundances of the large sample ~ 40,000 galaxies, which are very useful to reflect the origins of primary and secondary component of nitrogen element.
最后我们还计算了大样本星系的氮元素丰度,讨论了氮元素的起源。
参考来源 - 利用SDSS光谱数据研究恒星形成星系的金属丰度·2,447,543篇论文数据,部分数据来源于NoteExpress
AS临床流行病学调查:采用多中心,大样本临床调查。
Epidemiology investigation on AS: To adopt the multicenter, maximus sample clinical survey.
这项发现基于目前为止关于两种治疗方法最大样本量的对照研究。
The finding surfaced from the biggest comparison of the two treatment strategies ever carried out.
也有通过大样本人口的研究显示使用该产品可引起心血管疾病甚至死亡。
There are also studies among large populations that show cardiovascular disease and even death by using this product.
But you can imagine the inability to do that in a big population study with thousands and thousands of subjects, so we have to rely on data like this.
但你们可以想象在一个大样本研究中,不可能对数以千计的研究对象做这种培训,所以我们需要依靠像这样的数据
Roger Ibbotson took a look at a larger group of funds -3,500--funds over a ten-year period and found survivorship bias at 2.9% per year and backfill bias at 4.6% per year.
罗杰·伊博森研究了更大的样本组,3500支基金10年间的表现,算出其生存偏差是每年2.9%,回填偏差是每年4.6%
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