The article's definition of autocorrelation: Autocorrelation occurs when you correlate a variable with itself. Wikipedia's definition of autocorrelation:

The article's definition of autocorrelation: Autocorrelation occurs when you correlate a variable with itself. Wikipedia's definition of autocorrelation: Autocorrelation, sometimes known as serial correlation in the discrete time case, is the correlation of a signal with a delayed copy of itself as a function of delay. Of course, 0 delay is the trivial case of time delay but really, the article's definition is at best inaccurate. D-K has nothing to do with time delay and calling it autocorrelation seems like a weird pun that doesn't quite land.