Explain auto correlation for time series data

@sridharbabu wrote:

Can anyone kindly explain the Auto correlation plot obtained for time series data

I have attached an image with this post. The image has acf() plot obtained for a time series data
The plot does not converge to zero at any point, it is irregular.

Checked for stationarity, the time series data are found to be stationary.

I would like to know, how to select the max q value for the model.
Can similar procedures be followed for pacf() function also??

Thank you in advance

Rplot.jpeg867x545 56.3 KB

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