Introductory material on splines I am looking for a basic, step-by-step introduction into modelling with splines.
(I have encountered splines while teaching another topic. The textbook I am using does not cover splines in sufficient detail for the students to be able to replicate things by themselves. I hope there is some good introductory material out there so that I do not have to reinvent the wheel and write my own notes on the topic.)

I found the section on splines in Frank Harrell's Regression Modeling Strategies very helpful. Yes, the book is not only about splines, but if your students are learning about them, they may find the rest of this tome helpful, too.
