B Acknowledgments

Software is condensed collaboration. In my everyday work, I depend mostly on tools that other people freely write, maintain, and distribute. I thank all of those who maintain R and the infrastructure that supports it. The R packages used in this book can be found in the bibliographic references. I am grateful to those who helped me directly with comments and suggestions; indirectly by having independently solved problems I ran into myself; or unwittingly via the excellent example of their open and generous style of work. Thanks to Jenny Bryan, Mine Çetinkaya-Rundel, Dirk Eddelbuettel, Thomas Lumley, Torkild Lyngstad, John MacFarlane, Bob Rudis, Hadley Wickham, Claus O. Wilke, and Yihui Xie.

Conversations with Chris Bail, Jim Moody, and Steve Vaisey got me started on this project. Duke University and the Kenan Institute for Ethics gave me time to see it through. The Robertson Scholars bus goes back and forth between Duke and Chapel Hill on the half hour during term and is worth any number of vague endorsements of connection and collaboration between universities. It is where much of this book was written. Finally I thank the students at Duke, Yale, McGill, the University of Oslo, and Statistical Horizons who were the test-pilots for much of the material.