Stationarity issue in time series data

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Abdul Ghaffar
Abdul Ghaffar 2021-11-18
I have time series data (Number of malaria patients) consists of 125 sample observation.
I am going to apply ARIMA model.
When I check stationarit the series is non stationary.
I take first difference the series become stationary but the issue is that when I plot ACF or PACF for stationary series (1st difference) the ACF or PACF at lag 0 is 1.
Check the attach file. Please let me know how to handle this issue?
Thanks in advance

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