In the past two days readers had a chance to carefully examine ucla.in/2wpolWr (Appendix) and verify that health scientists communicate in terms of states of variables, as opposed to manipulations of variables. They talk about agents and substances being ``present''
or ``absent'', being at high concentration or low concentration, smaller particles or larger particles; they talk about variables ``enabling,''``disabling,'' ``promoting,''``leading to'' ``contributing to,'' etc. Branding these causal relationships "hopelessly ill-defined",
"extrascientific" or "White Magic" does not do justice to the bulk of scientific discourse. What for? Just because PO started with RCT perceived as the mother of all knowledge? #Bookofwhy #causalinference #EpiTweeter