How can a time-series data be declared as stationery?
Checks for Stationarity in time-series data
- Look at Plots : plot a run sequence plot to see anything with an obvious trend or seasonal effects
- Summary Statistics : partition your data into intervals and check for obvious or significant differences in summary statistics
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Statistical Test : use statistical tests if the expectations of stationarity are met or violated.
ref:https://medium.com/@kangeugine/time-series-check-stationarity-1bee9085da05
ref:https://towardsdatascience.com/detecting-stationarity-in-time-series-data-d29e0a21e638