There are three main types of descriptive methods: observational methods, case-study methods and survey methods.
描述性研究法一共分为三类：观察法，案例分析法以及调研法。
Objective to demonstrate, by case study, how to analyze the hospital data through the statistical methods in observational studies.
目的通过个案分析，说明如何采用观察性研究的方法对医院资料进行统计分析。
Objective to demonstrate, by case study, how to analyze the hospital data through the statistical methods in observational studies.
目的通过个案分析，说明如何采用观察性研究的方法对医院资料进行统计分析。
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