In your use case (testing algorithm's speed) may be perfectly fine to use rand as long the execution is not influenced by the statistical properties of the data.
在你的用例(测试算法的速度)可以完全正常使用rand只要执行不由数据的统计特性的影响。
We have to draw statistical inference by hypothesis testing, because we don't know the real data generation process of any time series.
对于一个实际的时间序列数据，我们并不知道其真正的数据生成过程，只能通过假设和基于假设的统计推断来确定。
Although there has been much work focused on searching gene sets using gene expression data or other prior information, proper statistical testing of the gene sets is still an open question.
尽管目前已经有很多工作利用基因表达谱数据以及一些其他的先验知识来寻找那些与肿瘤相关的基因集合，但还是没有一个恰当的基因集合的统计学方法。
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