Abstract
Comparison of two test purification procedures to assess DIF with Lord's statistic and Raju's area measures. Several studies have tested the effectiviteness of iterative test purification procedure in order to improve the identification of Differential Item Functioning (DIF) againts no-iterative test purification procedures. However, iterative test purification procedures are very cost because they have many calculations. In this study the bietapic purification prodedures of Miller & Oshima (1992) and bietapic purification procedure of Hidalgo & López (1997) are compared, by taking into account correct identifications and false positives rates, and carrying out Lord's statistic (1980) and Raju's exact area measures (1990) like DIF assessing measures.
