This article discusses how to make up a test data set so that it is large enough to be useful for testing and has the expected distribution of values and correlation between columns.

本文讨论了如何构建一个测试数据集，以使该数据集达到用于测试的规模，并且具有期望的值分布和列间相关性。

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And then we're going to try a demo to see if we can convince ourselves that the kind of calculations we make work out perfectly, and we'll do a test up here about half way through class.

然后我们将会尝试演示去看看,是否可以确信我们能够很好的,做出这个类型的计算，我们将在课程中做一个测试。

麻省理工公开课 - 化学原理课程节选

The obvious initial inference to make about a test that does not pick up a difference where you expect one is that it is not a very good test.

NEWYORKER: Live and Learn

But he said that the reasons for humans becoming addicted to any drug were more complex than simply their genetic make-up, and that a test for any gene uncovered by further research would not necessarily work.

BBC: NEWS | Health | Key differences in addicts brains

It is always interesting to see what clues the selection offers about the possible make-up of the Test team and there are a couple of combinations that look like they might be used in the Tests.

BBC: Jeremy Guscott column