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Can someone help me out with this? I have a first difference TS that has a constant mean around zero, but the variation differs for some periods. enter image description here

I get the following ACF and PACF enter image description here

What can be a possible model for this TS? Can I say a ARIMA(0,1,1) is suitable?

kjetil b halvorsen
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user212218
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  • post your data and I will try and help you as the acf/pacf analysis is only valid under certain circumstances – IrishStat Jun 28 '18 at 09:58

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