Autocorrelation
Function
The Autocorrelation at the
given lag. The ACF will vary between -1 and +1, with values near 1
indicating stronger correlation.
for m=2,3,4,…,n/4 where n is the number
of observations, and x-bar is the average of the observations
1
indicating stronger correlation.
for m=2,3,4,…,n/4
where n is the number
of observations, and x-bar is the average
of the observations