> Surely there's a "control" shipping lane somewhere that was cleaner to begin with or never cleaned up.
Isn't the shipping lane the "treatment" group and everywhere else in the world the "control" group?
Like we administered x mg of sulfer to the patient and they saw y outcome while patients not receiving sufler saw z outcome. When we stopped administering sulfer all patients saw z outcome seems to be isolating sulfer as causing y.
> Like we administered x mg of sulfer to the patient and they saw y outcome while patients not receiving sufler saw z outcome. When we stopped administering sulfer all patients saw z outcome seems to be isolating sulfer as causing y.
There is a reason we use placebos for control groups.
I'm more interested in the reason the OP had in mind. I don't think it's required that you have a placebo control group, but the OP might have a reason in mind that's something I haven't considered.
Isn't the shipping lane the "treatment" group and everywhere else in the world the "control" group?
Like we administered x mg of sulfer to the patient and they saw y outcome while patients not receiving sufler saw z outcome. When we stopped administering sulfer all patients saw z outcome seems to be isolating sulfer as causing y.