Acknowledgments

Many people provided useful comments on earlier versions of this book. I particularly want to thank Nicholas Christakis, Theodore Venet, and the participants in my 1994 and 1995 summer workshops on survival analysis. For permission to use data, I am indebted to Nicolas van de Walle, Henry Bienen, Kenneth Lenihan, and Scott Long. Stephen Lagakos helped me clarify some of the ideas in Chapter 6. I am especially grateful to the reviewers who discovered several errors and made numerous suggestions for improvements: Bruce Turnbull, Michael Phelan, Donna Neuberg, Ying So, Michael Stockstill, Gordon Johnston, and Annette Sanders. I take full responsibility, of course, for any errors that remain. My editor, Judy Whatley, was unfailingly efficient, helpful, and pleasant.