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The generous contributions of James Power from Maynooth University and Charlie Daly from Dublin City University have much improved this second edition. I am deeply appreciative of their advice and help, and their provision of many relevant examples in areas of computing that have evolved since the first edition was published. They also read much of the new material and supplied valuable feedback. As I write this, we are in a state of shock at the sudden and untimely death of our close friend and colleague James Power. Maynooth University, Computer Science in Ireland and the Academic World generally are greatly diminished by his departure. It is difficult to accept his absence. We had so much more to learn from him.

I owe a huge debt of gratitude to Helen Fallon, Deputy Librarian at Maynooth University, who provided library facilities and ongoing assistance with the tracking down of material, relevant articles, and books.

A special word of thanks to my technical advisors: Systems analyst Rosaleen McGrath provided invaluable advice and help with file management. Jim Doyle and Eugene Curran continued to ensure that I had the best hardware and best software. Mathematician Robin Harte checked the mathematical derivations in the appendices and helped with the final edit.

As teachers, we should always remember that not only do we teach but also we are taught. Throughout my working life, I have been privileged to work with students, both in Ireland and abroad, who never ceased to inspire me. I am indebted to all who took this course over the years, and provided invaluable comments and constructive suggestions. I also appreciate the feedback from instructors who used the original version of the book, as well as those who reviewed it. Thank you to those who sent me words of appreciation, alerted me to errata and made useful suggestions. I hope you will continue to do so. My email address is

janemhorgan@gmail.com

I continue to be indebted to the developers and the core team of R for maintaining and extending the R system which is so important for teaching and research. As always, it has been a pleasure to work with the production team of John Wiley & Sons.

Thanks to my colleague and neighbor Margaret Byrne for her ongoing catchphrase “will that book of yours ever get finished?”; to all my friends in Kuşadası for putting up with me; apologies for those cancelled Turkish classes, missed appointments, lunch dates, and nights out.

Finally, let me thank my gambling trio. Jane, the former princess, is now a queen of hearts, Amy, once a pirate, is now the club ace, and the precious diamond Ava, not around in time for the first edition, is the youngest member of the club, and a force to be reckoned with.

Jane M. Horgan

2019