AbsoluteCorrelationFunction

AbsoluteCorrelationFunction[data,hspec] estimates the absolute correlation function at lags hspec from data.

AbsoluteCorrelationFunction[proc,hspec] represents the absolute correlation function at lags hspec for the random process proc. 

AbsoluteCorrelationFunction[proc,s,t] represents the absolute correlation function at times s and t for the random process proc. 

Please visit the official Wolfram Language Reference for more details and examples on core symbols.