Mostly Harmless Econometrics: An Empiricist’ Companion s Joshua D. Angrist Massachusetts Institute of Technology Jörn-Ste¤en Pischke The London School of Economics March 2008 ii Contents Preface Acknowledgments Organization of this Book xi xiii xv I Introduction 1 3 9 10 12 16 1 Questions about Questions 2 The Experimental Ideal 2.1 2.2 2.3 The Selection Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Random Assignment Solves the Selection
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THE ON OT C OP YO CASE STUDY HANDBOOK RP OS T ON OP YO RP OT C OS T THE ON OT C Write Persuasively About Cases OP CASE STUDY HANDBOOK How to Read, Discuss, and William Ellet Harvard Business School Press Boston, Massachusetts YO RP OS T Copyright 2007 William Ellet All rights reserved Printed in the United States of America 11 10 09 08 07 5 4 3 2 1 No part of this publication may be reproduced, stored in or introduced
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