Sample autocorrelation of data at a given lag
CorrelationFunction[data, hspec]
CorrelationFunction[proc, hspec]
CorrelationFunction[proc, s, t]
CorrelationFunction[{2, 3, 4, 3}, 2]
→ -1/2CorrelationFunction[BinomialProcess[p], s, t]
→ Min[s, t]/Sqrt[s*t]CorrelationFunction[WienerProcess[μ, σ], s, t]
→ Min[s, t]/Sqrt[s*t]