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.
Mangda ngalidin kahanan sané ngawinang kahanan eksperimen dados kirang maguna, dokter sané ngamargiang uji coba medis—minakadi ring pamutus Badan Pengawas Obat dan Makanan AS—ngukur miwah ngacak kovariat sané prasida kaidentifikasi.