Correlation may not imply causation, but let’s just ignore that for a second. Correlations are standardized effect size metrics and as such have some quirks by design. These are benign enough when you just calculate a single correlation coefficient and look at it, but things can get really messy onc| The 100% CI
In some fields, researchers who end up with time series of two variables of interest (X and Y) like to analyze (reciprocal) lagged effects between them. Does X affect Y at a later point in time, and does Y affect X at a later point in time? These questions are usually addressed with some sort of pan| The 100% CI