I have a question on a ACF/PACF result reported below.
Using a daily time series composed by 953 values I have the following result plotting the acf and pacf results.
My questions are:
how can I interpret the fact that in the ACF there are a kind of pick at lag 7, 14, 21 ,ecc ? It seems drop down only at 600th lag
how can I interpret the PACF result due to this stange behavior ?