LIR832 SPRING 2007 Leture 8 2 slides

LIR832 SPRING 2007 Leture 8 2 slides - Topics for This...

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1 Topics for This Evening ± What Are the Characteristics of Good Research? ² Tufte ² Loury ² Boiler Plate Questions ± How Do We Handle Qualitative Data in a Regression? ² Dummy Variables LIR 832 – Lecture 8 The Good, the Bad and the Ugly: Tufte: Good and Bad Analysis of Quantative Data Loury: Gender Earnings Gap
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2 Tufte ± Group 1: What did John Snow do in his analysis of the cholera epidemic that allowed him to support his theory (causal relation) about water and cholera? ± Group 2: What ended up obfuscating the relationship between temperature and O-ring failure in the analysis pre and post Challenger Disaster?
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3 Classic Approach to Research ± How to write a research paper, an article and what to look for in statistical research z Find an interesting or pressing question z Review literature and develop a theoretic model ² What is a theoretic model? z b. Specify the empirical model: selection of independent variables and functional form. ² What do we mean by an empirical model? How is this different from a theoretic model? z c. Hypothesize the expected signs of the coefficients z d. Collect the data z e. Estimate and evaluate the equation z f. Document the results Opening of the Gender Earnings Gap ² What do we learn in the opening two paragraphs? ± i. The issue addressed by the paper ± ii. What has gone before ± iii. How this paper contributes to the literature (knowledge) ± iv. Why is this important?
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4 Review Literature and Develop a Theoretic Model ± Relevance of the Research Question ² College educated women made up a large and growing segment of the population ² While most studies of the decline in the gender earnings gap present aggregate results across different years of schooling, factors that are responsible for narrowing the gender gap may differ by skill level. ² An analysis of the effects of college selectivity and academic performance makes it possible to determine whether gains have been uniform for all college educated women or whether some individuals have benefitted relative to others. Explanations of Changes in Gender Differences in Earnings ² relative gain in the number of years worked by women compared to men. ² changed in perceptions about appropriate role of women in the labor market ² changes in industrial structure & the desired skill mix of workers within industry ² Note that each reason is developed and often supported by other information
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5 Data and Empirical results ± Description of data used in the study ± NLS data sets z longitudinal (follow individuals over time) z when and how collected z types of data collected z easy to find the data and obtain additional information (standard data sets) ± Data is limited to white employees, why? ² How does this limit what we can learn from the study?
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LIR832 SPRING 2007 Leture 8 2 slides - Topics for This...

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