average and 0 when there's no relationship between when they're above or below average let's look at some examples what this looks like so here is a plot of a density of a Gaussian mean at 1 0 the first axis is this 1 the second axis is this 1 in all these plots Center deviation 1 for each coordinate so symmetric Gaussian which keeps television while we shift it now the mean is at negative 0.5 for the first query we see it shifted what if we shifted even more will so shifted for the second coordinate to mean again this