precision 1) a measure of accuracy of a piece of data, cf. e.g., Ch. 1, §6, where it is usually Boolean (name propagation) or reflects the kurtosis of a skewed probability distribution (date propagation or locality propagation; 2) a measure of efficiency; a) blocking p. compares the matched records in the block with all the records in the block; b) weighting p. compares the matched records above threshold with all the records above threshold, cf. Ch. 4, Ch. 4, §2 [Cf. recall]