To avoid conditions that render an experiment far less useful, physicians conducting medical trials—say for U.S. Food and Drug Administration approval—quantify and randomize the covariates that can be identified.
Ye agadal ən idagan tajanen irum awaren infa as tajute, imassafaran tajanen iruman ən səfran sund ye assəhəsku ən Food and Drug Administration ən Amérique sajat izar taju anməshənzi adoben adəqəl atwəzay.