PUBL0055 Introduction to Quantitative Methods

A.计算起草人和未起草人之间的平均信任度差异。提供简要

B.解释“抽样分布”的概念。样本分布的形状是什么

C.使用公式计算标准差和均值差的95％置信区间

D.现在通过使用线性回归来估计相同的效果。将结果显示在表格中，解释

A.拟合一个线性回归模型，该模型除了包括种族种族和出生年份外还包括协变量

B.在您适合A部分的多元回归模型中，充分解释其幅值和统计数据
RaceEthnicity变量的水平Black的系数的显着性。
C.从Vote12Obama，AffordableMistake，伊拉克Mistake，
AttendedPolEvent和意识形态可能会告诉您有关起草的长期影响

（出于这个问题的目的，您可以运行带有二进制因变量的线性回归模型。）

Question 3
Use a multiple linear regression model to investigate whether the effects of being drafted on levels of trust
are different for the different race/ethnicity groups defined in the variable RaceEthnicity (White, Black
and Hispanic). Write a short essay describing what you find, including an assessment of the strength of the
evidence for any differences (or lack thereof) that you find.
In writing this essay, you might want to:
• Provide relevant descriptive statistics for the key variables
• Explain how you set up the model(s) to make this assessment
• Present your regression estimates in a table along with the other models for trust that you fit in
Questions 1D and 2A.
• Construct fitted values for relevant cases to illustrate the relationships described by the model.
Please note that you need not present all of these, you should aim to clearly describe the data and what they
can tell us about differences in the long-run effects of being drafted for individuals in the three race/ethnicity
categories in the data set.
Question 4
A. Calculate, compare and interpret the yearly outcomes by treatment group. What does this tell you?
B. Using the data from the years 2007 (the last year of the pre-treatment period) and 2008 (the first year of
the post-treatment period), compute the difference-in-differences estimate of the effect of municipal merger
on public service delivery costs.
C. Use an appropriate linear regression to calculate the same difference in differences estimate that you
calculated in part B. Show that you get the same numerical value, and use the results of the regression to
test the null hypothesis that the difference in differences is equal to zero. Interpret your results in terms of
the research question posed at the beginning of this section.

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