stationarity in time series analysis

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[@rayhankabir645]

thank you very much sir

[@kavishkagimhani9803]

you explained it very well.thank you sir

[@quangminhtrinh3888]

Thank you for your help. You have illustration and examples, which helps me better understand this concept

[@kratikasoni6497]

Why var(Xt) is equal to var(yt) +var(yt-1) and not var(yt) +var(yt-1) + cov ( yt, yt-1)