ec 331 01 02 econometrics i fall 2011 lecture notes chapters 1 2 3 n.
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EC 331. 01&02 ECONOMETRICS I Fall 2011 Lecture notes Chapters 1-2-3. Brief Overview of the Course. This course is about using data to measure causal effects. In this course you will:. Review of Probability and Statistics (SW Chapters 2, 3). The California Test Score Data Set.

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initial look at the data you should already know how to interpret this table
Initial look at the data:(You should already know how to interpret this table)
  • This table doesn’t tell us anything about the relationshipbetween test scores and the STR.
slide8
Question: Do districts with smaller classes have higher test scores? Scatterplot of test score v. student-teacher ratio

What does this figure show?

slide9
We need to get some numerical evidence on whether districts with low STRs have higher test scores – but how?
initial data analysis compare districts with small str 20 and large str 20 class sizes
Initial data analysis: Compare districts with “small” (STR < 20) and “large” (STR ≥ 20) class sizes:

1. Estimation of  = difference between group means

2. Test the hypothesis that  = 0

3. Construct a confidence interval for 

b moments of a population distribution mean variance standard deviation covariance correlation
(b) Moments of a population distribution: mean, variance, standard deviation, covariance, correlation