Example Data Set Where Seasonal Variation Changes

[JohnSparks2024]

Greetings from Chicago! Thanks so much for your open source book, fpp3. I plan to use it for a course that I will be teaching in Fall semester.

I noticed towards the end of your chapter on time series decomposition that you mention the situation in which the seasonality effect changes, and not in proportion to the trend (pg. 78, 3rd bullet in the print version).

I would like to be able to demonstrate this to my students.

Do you have an example data set that shows this phenomenon?

Thanks.
--John Sparks

[robjhyndman]

See the canadian_gas data, subject of Exercise 3 in https://otexts.com/fpp3/decomposition-exercises.html#decomposition-exercises.