How to check the time dependence for price stock in R? How to check the mean constancy for price stock in R?

Hello everyone!
How to check the time dependence for price stock in R? How to check the mean constancy for price stock in R?

Here's a good reference to get you started - Forecasting: Principles and Practice by Hyndman and Athanasopoulos

Thank you so much @SBH

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