基本概念 基本概念 (1)总体与样本(population and sample): 1总体(population):根据研究的目的所划 定范围内的同质的个体构成的全体。 样本(sample):总体 中随机抽取的一部 分。
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医学统计学简介(Introduction to medical statistics) 医学统计学的几个重要概念 总体和样本(population and sample) 总体与样本的关系: 医学统计学简介(Introduction to medical statistics) 医学统计学的几个重要概念 同质(homogeneity)和...
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The reasons there are two main expressions for population and sample" is that one is biased estimator and the other is not."
“母体”与“样本”之所以有两种表达公式,是因为一个是有偏估计,另一个则不是。
These are called population measures because they refer to the whole population of possible outcomes and they measure the probabilities. It's the truth, but there are also sample means.
这种被称为人口测量学,因为他们是指整个人口可能的结果输出和测量概率,这是事实,但也有样本均值。
The study is based on a large population sample and took into account other possible factors, such as depression, season and levels of physical activity.
这项研究基于大群体样本,并且考察分析了其他可能影响的因素,如忧郁,季节和身体活动水平。
And the other thing you can do is take self reports like the ones you're doing, hopefully do enough of them, and a random enough sample of the population, that you can extrapolate from that sample to the whole population, and try to estimate what people are eating in that way.
还有其他可以做的,比如大家正在做的这种个体调查,希望能把它做的充分些,如果有充足的随机样本,就可以从样本推断出,整个总体,从而推断哪类人有这样的饮食习惯
This is very important,which is why I am doing it: "If we want to know how fast a human being can run, then it is no use to average out the speed of a "good sample" of the population; it is far better to collect Olympic gold medal winners and see how well they can do.
这话非常重要,是我作这个研究的原因:,“如果想知道人类最快能跑多快,那从好的样本中测出平均数是“,没用的;,而应该收集田径类奥运冠军的信息,看他们能跑多快。
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