Evaluating measurement equivalence using the item response theory log-likelihood ratio (IRTLR) method to assess differential item functioning (DIF): applications (with illustrations) to measures of physical functioning ability and general distress.
Teresi JA; Ocepek-Welikson K; Kleinman M; Cook KF; Crane PK; Gibbons LE; Morales LS; Orlando-Edelen M; Cella D; Quality Of Life Research: An International Journal Of Quality Of Life Aspects Of Treatment, Care And Rehabilitation, 2007, vol. 16 Suppl 1, p 43, ISSN 09629343. ISBN 09629343.

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