About linear correlation: there's a Derrida point in statistics where everything becomes relative to a model. Linear correlation is the preferred mode for cardi

About linear correlation: there's a Derrida point in statistics where everything becomes relative to a model. Linear correlation is the preferred mode for cardinal (not ordinal) quantities because it's directly related to linear ANOVA (the decomposition of variance between "explained by the covariate" and "unexplained by the covariate") (among many other reasons), but it's a choice. There's nothing outside theoretical decision.