有效性【名词】1. 正确，正当，妥当，确实性; 2. 【法律】有效，真确，合法性; 3. 【哲学】效准
the extent to which a measuring device measures what it intends or purports to measure. construct validity the degree to which an instrument measures the characteristic being investigated; the extent to which the conceptual definitions match the operational definitions. content validity verification that the method of measurement actually measures what it is expected to measure;
An index of how well a test or procedure in fact measures what it purports to measure; an objective index by which to describe how valid a test or procedure is.