random walk
statsmodels
Augmented Dickey-Fuller test
It it a random wark? stationary?
statsmodels.tsa.stattools.adfuller
https://www.statsmodels.org/dev/generated/statsmodels.tsa.stattools.adfuller.html#statsmodels-tsa-stattools-adfuller
Examples
串本・浦神潮位差と日本南岸の黒潮緯度 (on google colaboratory )
https://colab.research.google.com/drive/1oFYvIrQ9TuFgjClZx3-5IZ7ayyqUT8on#scrollTo=8NyAnBAdCaA7