inference, in logic, derivation of conclusions from given information or premises by any acceptable form of reasoning. Inferences are commonly drawn (1) by deduction, which, by analyzing valid argument forms, draws out the conclusions implicit in their premises, (2) by induction, which argues from many instances to a general statement, (3) by probability, which passes from frequencies within a known domain to conclusions of stated likelihood, and (4) by statistical reasoning, which concludes that, on the average, a certain percentage of a set of entities will satisfy the stated conditions. See also deduction; implication.