[The necessary number of groups for observations in controlled clinical research. Groups with equal numbers].
D002986:Clinical Trials as Topic / Q000379:methods*; D006801:Humans; D008495:Medical Oncology; D012107:Research Design; D013223:Statistics as Topic
Neobkhodimaia chislennost' grupp nabliudeniia pri kontroliruemykh klinicheskikh issledovaniiakh. Ravnye po chislennosti gruppy.