ACF and PACF are not converging to zero even after taking the 2nd order difference of time series in ARIMA Model

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Tasarruf Bashir il 27 Mag 2021

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https://it.mathworks.com/matlabcentral/answers/841385-acf-and-pacf-are-not-converging-to-zero-even-after-taking-the-2nd-order-difference-of-time-series-in

Modificato: Tasarruf Bashir il 27 Mag 2021

Hi all,

ACF and PACF are not converging to zero even after taking the 2nd difference of time series in ARIMA Model, when at the same time the ADFTest is giving the hypothesis h value is 1 and p valaue 1*e-3. what to do now? here the results are shown below, thanks in advance