Some research terms for beginners: definitions, comments, and examples. I.
D003142:Communication; D003201:Computers; D004989:Ethics; D005500:Follow-Up Studies; D006306:Health Surveys; D006801:Humans; D008433:Mathematics; D010361:Patients; D010919:Placebos; D011159:Population Surveillance; D011336:Probability; D012106:Research; D012494:Sampling Studies; D013223:Statistics as Topic
D010919:Placebos