Lord, Frederic M.Wingersky, Marilyn S.2011-03-292011-03-291984Lord, Frederic M & Wingersky, Marilyn S. (1984). Comparison of IRT true-score and equipercentile observed-score "equatings." Applied Psychological Measurement, 8, 453-461. doi:10.1177/014662168400800409doi:10.1177/014662168400800409https://hdl.handle.net/11299/101999Two methods of ’equating’ tests are compared, one using true scores, the other using equipercentile equating of observed scores. The theory of equating is discussed. For the data studied, the two methods yield almost indistinguishable results.enArticle