让我们一起看看几个重采样（resampling）技术： 2.1.1 随机欠采样（Random Under-Sampling） 随机欠采样的目标是通过随机地消除占多数的类的样本来平衡类分布；直到多数类和少数类的实例实现平衡，目标才算达成。
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To test your null hypothesis, you want to know the probability of obtaining a value this extreme under the assumption that it is due to random sampling variability.
要检验虚假设，需要知道在假设存在随机抽样可变性的情况下获得这么一个极限值的概率。
We randomly selected 806 children under 6 years of age from 45 primary anganwadi (childcare) centres in Chandigarh, Punjab, India, that were chosen through multistage stratified random sampling.
在印度旁遮普省昌迪加尔的45所托儿所(anganwadi)中心采用多级分层随机取样法选择了806名6岁以下儿童。
Under certain hypothesis a heuristic search can be considered as a random sampling process. Thus, it is possible to transfer the statistical inference method to the heuristic search.
在一定的假设下，可以把启发式搜索看作一种随机取样的过程，从而可以把统计推断方法引进搜索。
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