这些作业都没有特定答案。我不会指定你该用什么相依变数、该解释什么…等等。这样的部份目的是要让你练习如何使用数据、估计模型和使答案合理化。利用课程15.347所学，你要规划出数据的概念性模型和统计模型。这门课较大的限制是你只能使用当周课堂中讨论的方法（例如：计算模型）。我都已经将适当的数据资料设定好，不过你也可以使用自己取得的数据。

The assignments are deliberately open-ended. It is not specified what the dependent variable should be, what you are trying to explain, etc. Part of the goal of these exercises is to give you practice with working with data, estimating models and making sense of the results. In the language of 15.347, I want you to formulate a conceptual model of the data as well as a statistical model. The major constraint is that you apply the method discussed during that week's class (e.g., count models). I will make appropriate datasets available for this purpose, but you are also allowed to use your own data sources.