To my parents, Barbara and Oscar Machlis, who gave me a great start in life, including instilling a love of learning. I miss you every day.

To my husband, Lee Gartenberg, for your love and unwavering support during countless hours of research, writing, and editing. Life is better because we’re together.

And to the R community: Thanks to all of you who have written packages, shared other code, answered questions, and gone out of your way to create a welcoming and generous place. I hope to pay it forward.