How to STATA

Following are examples of how to create new variables in Stata using the gen (short for generate) and egen commands: To create a new variable (e.g., newvar ) and set its value to 0 , use: gen newvar = 0 To create a new variable (e.g., total ) from the transformation of existing variables (e.g., the sum of v1 , v2 , v3 , and v4 ), use: gen total = v1 + v2 + v3 + v4 Alternatively, use egen with the built-in rowtotal option: egen total = rowtotal(v1 v2 v3 v4) Note: The egen command treats missing values as 0 . To create a variable (e.g., avg ) that stores the average of four variables (e.g., v1 , v2 , v3 , and v4 ), use: gen avg = (v1 + v2 + v3 + v4) / 4 Note: Use the / (slash) to denote division and an * (asterisk) for multiplication. Alternatively, use egen with the built-in rowmean option: egen avg = rowmean(v1 v2 v3 v4) Stata also lets you take advantage of built-in functions for variable transformations. For example, to take the natura...

Chapter Outline   1.0 Introduction 1.1 A First Regression Analysis 1.2 Examining Data 1.3 Simple linear regression 1.4 Multiple regression 1.5 Transforming variables 1.6 Summary 1.7 Self assessment 1.8 For more information 1.0 Introduction This book is composed of four chapters covering a variety of topics about using Stata for regression. We should emphasize that this book is about “data analysis” and that it demonstrates how Stata can be used for regression analysis, as opposed to a book that covers the statistical basis of multiple regression.  We assume that you have had at least one statistics course covering regression analysis and that you have a regression book that you can use as a reference (see the Regression With Stata page and our Statistics Books for Loan page for recommended regression analysis books). This book is designed to apply your knowledge of regression, combine it with instruction on Stata, to perform, understand and interpret regress...