...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 Problem . . . . . . . . . . . . . . . . . . . . . . . . Regression Analysis of Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II The Core 19 21 22 23 26 30 36 38 38 44 47 51 51 3 Making Regression Make Sense 3.1 Regression Fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1.1 3.1.2 3.1.3 3.1.4 3.2 Economic Relationships and the Conditional Expectation Function . . . . . . . . . . . Linear Regression and the CEF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Asymptotic OLS Inference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Saturated Models, Main E¤ects, and Other Regression Talk . . . . . . . . . . . . . . . Regression and Causality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.1 3.2.2 3.2.3 The Conditional Independence Assumption . . . . . . . . . . . . . . . . . . . . . . . . The Omitted Variables Bias Formula . ....
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...maStuff My Stocking M/M Romance Stories that are Nice and… Naughty Stuff My Stocking: M/M Romance Stories that are Nice and… Naughty An M/M Romance Group Publication copyright 2010 With stories by: M.J. O'Shea Brian Jackson Deanna Wadsworth Missy Welsh Jade Archer Michael S. Xara X. Xanakas Mark Alders Em Woods Rachel Haimowitz SJD Peterson Kari Gregg Kim Dare A.J. Llewellyn Serena Yates Ocotillo Jessica Freely Heinrich Xin William Cooper Wren Boudreau Selah March Sarah Madison Stephani Hecht Amy Lane Angela Benedetti edited by: Diane W. (mailto:diane.goodreads@gmail.com) Jason B. Kathy H. Stuff My Stocking: M/M Romance Stories that are Nice and… Naughty What you’ve gotten yourself into… The stories you are about to read are the product of a very special project sponsored by the Goodreads M/M Romance groupthe online community for readers who love to read about men in love (Male/Male). The group moderators issued an invitation for members to choose a photo and pen a Letter to Santa asking for a short M/M romance story inspired by the image; authors from the group were encouraged to select a letter and write an original tale. The result was an outpouring of creativity that shined a spotlight on the special bond between M/M romance writers and the people who love what they do. This book is an anthology of those letters and stories. Whether you are an avid M/M romance reader or new to the genre, you are in for a delicious treat. So sit back, relax and enjoy...
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