Everything Is Correlated
“Why summaries of research on psychological theories are often uninterpretable”, Meehl (also discussed in Cohen’s paper “The Earth is Round (p < 0.05)”): Problem 6. Crud factor: In the social sciences and arguably in the biological sciences, “everything correlates to some extent with everything else.” This truism, which I have found no competent psychologist disputes given 5 minutes reflection, does not apply to pure experimental studies in which attributes that the subjects bring with them are