This is a how-to guide on the approximation of data. There are many books and articles on curve-fitting. This is intended as a supplement to, not a replacement for, such texts. Most references are either esoteric or simplistic. I hope to strike a balance between these two extremes and trust you will find this helpful. Many examples are included and all of the source code is available on-line.
I started writing novels (24 so far) and textbooks (47 so far) after semi-retiring from a long career in industry. In so doing, I hope to entertain, encourage, and also pass on what I have learned.