Riemann surface
matlab
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计量经济学基础概念：涵盖计量经济学的基本概念，如最小二乘法、多元线性回归等。
模型设定和识别：研究如何设置和识别经济模型，包括模型的假设和检验。
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参数估计和假设检验：研究参数估计的方法，如最大似然估计，以及假设检验的实现，如t检验和F检验。
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1.1 (i) Ideally, we could randomly assign students to classes of different sizes. That is, each student is assigned a different class size without regard to any student characteristics such as ability and family background. For reasons we will see in Chapter 2, we would like substantial variation in class sizes (subject, of course, to ethical considerations and resource constraints).
C1.1 (i) The average of $e d u c$ is about 12.6 years. There are two people reporting zero years of education, and 19 people reporting 18 years of education.
(ii) A negative correlation means that larger class size is associated with lower performance. We might find a negative correlation because larger class size actually hurts performance. However, with observational data, there are other reasons we might find a negative relationship. For example, children from more affluent families might be more likely to attend schools with smaller class sizes, and affluent children generally score better on standardized tests. Another possibility is that, within a school, a principal might assign the better students to smaller classes. Or, some parents might insist their children are in the smaller classes, and these same parents tend to be more involved in their children’s education.
(ii) The average of wage is about $\$ 5.90$, which seems low in the year 2008 .
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