How to find the Q and P values in autocorrelation and partial autocorrelation plots?

Question

From the above autocorrelation plot, I wanted to calculate the q value of moving average MA(q).

From the above autocorrelation plot, I wanted to calculate the p-value of autoregression model AR(p)

Answer 1

To calculate ‘p’ and ‘q’ values we must know what is a lag: Lag is the estimated delay like correlation. 

Correlation shows us the similarity between the two ‘time-series’. Autocorrelation shows how similar one time series is with itself.

You can use tidyquant package and use lag.xts() function to calculate:

lag(x, k = 1, na.pad = TRUE, ...)

X - an xts object

K -period of lag over

Na.pad -pad vector to its original size

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