[![enter image description here][1]][1] [![enter image description here][2]][2] [1]: https://i.sstatic.net/nSTwm.jpg [2]: https://i.sstatic.net/9h87h.jpg I was thinking, from the ACF it looks like a nonstationary process. Or is it an AR Process? From the pACF, does that mean it is AR1? THere are 2 significant spikes in the PACF. Im confused :(