Following on from the previous tutorial on how to smooth time series data, this video runs through an example question covering all the steps to do with smoothing and using smoothed trend lines to make predictions. The question comes from the MathsWorld further mathematics textbook published by MacMillian (2005).
Speaking of that textbook, it is available for preview on google books. The chapters that you can view seem to change now and then, because the statistics chapters used to be available but now aren’t. In their place however, you can now view all the pages on the geometry and trig module, and most of the pages on the business maths module, plus large chunks of the modules on graphs and relations, networks and matrices. A lot of students find it helpful to get things explained in a few different ways; if you use one of the other textbooks in class, why not have a read of the explanations that these authors give too? It might help you understand some concepts in more depth. They have good worked examples in this book. Plus, it’s free! Hard to argue with that.
Anyway back to the point -- here is some more tutoring on smoothing time series data: