What is the proper statistical test to check if a single time-series is different than a group of multiple time-series of the same variable?

Hello, I have a set of 21 time-series with weekly data of the same variable from years 2000 to 2020 (January to mid-May only). The figure illustrates those 21 time-series. I want to evaluate if...

26 May 2020 1,004 3 View