多米尼西说准实验法是近似一个随机实验的很好方法，“尤其是在这种不可能做随机实验的情况下。”
Dominici said the quasi-experimental approach was a good approximation of a randomized experiment, "especially in this situation where a randomized experiment is not possible. ""
其中最重要的方法有三种：事件案例分析法、自然实验法和准试验法。
In all the researching methods, the three kinds is the most important, that is events and cases analyzing method, natural experiment method and semi-experiment method.
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