Differential Item Functioning National Examination on Device Test Mathematics High School in Central Java

This research aims to determine The Differential Item Functioning that occurs between participants from the district and the test takers from the city area of the item from the National Math Exam Test in the academic year 2014 / 2015 in the Central Java in terms of item response theory. The study population was a student’s response participant for National Examination in Mathematics High School Scince High School in 1103 Packs 2014 / 2015 school year in Central Java. Samples were taken by using purposive random sampling systematic spread over 6 districts and 5 municipalty with total participants of 4.107 students. Sampling is reached through two stages. To detect the DIF, the territory divided into two groups of reference (A) and the study group (B). A group in this study is rayons which area in districts thath Brebes, Tegal, Pekalongan, Kendal, Semarang regency and district, Magelang with total sample size of 2.121 responses answers. Group B is determined that all five regions, namely the municipal area of Semarang, Tegal, Pekalongan, Salatiga, and Magelang City with a total sample size of 1.986 response answers. The result showed using the Rasch model of item response theory to estimate the level of difficulty grain. Waldtest for detecting Differential Item Functioning (DIF) which is operated by using a software program R version 3.2.3. There are 22 test items were detected between participantsexperienced DIF test of the district and of the city of test participants.