The purpose of a double blind or double masked study is to avoid observer and subject bias.
Why is "achieve comparability of treated and untreated subjects" not correct?
If the study is double blinded, is not the objective equal and unbiased comparability of treated and untreated subjects??© BrainMass Inc. brainmass.com September 20, 2018, 5:17 am ad1c9bdddf - https://brainmass.com/statistics/data-collection/double-blind-study-142645
I agree with you that a double blinded study is meant to ensure that observers treat both groups equally and ...