计量经济学Ch_07_Wooldridge_5e_PPT.ppt

? 2012 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Chapter 7 Multiple Regression Analysis: Qualitative Information Wooldridge: Introductory Econometrics: A Modern Approach, 5e ? 2012 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Multiple Regression Analysis: Qualitative Information Describing Qualitative Information A Single Dummy Independent Variable Using Dummy Variables for Multiple Categories Interactions Involving Dummy Variables A Binary Dependent Variable: The Linear Probability Model More on Policy Analysis and Program Evaluation Assignments: Promblems 5, 7, 9, Computer Exercises C2 , C6, C7, C9 ? 2012 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ? Examples: gender, race, industry, region, rating grade, …? A way to incorporate qualitative information is to use dummy variables ? They may appear as the dependent or as independent variables ? The name in this case indicates the event with the value one. ? Why do we use the values zero and one to describe qualitative information? Multiple Regression Analysis: Qualitative Information Describing Qualitative Information Chapter ? 2012 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Multiple Regression Analysis: Qualitative Information A Single Dummy Independent Variable (1/ 7) Chapter Intercept shift Definition of dummy variable Interpret ?? Base group or benchmark group Implication of the same slope for both genders ? 2012 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly