The purpose of this study is to equate and further validate three forms of the vocabulary size test (VST) created by Aizawa and Mochizuki (2010). These three forms, VST 1, 2, and 3, were administered to a cohort of 189 high school students ranging in age from 16 to 18 in April of their 1st, 2nd, and 3rd year of high school. Although these…

The new national educational policy was implemented at secondary schools in 2002 in Japan. The revised Course of Study for foreign language education corresponding to the national educational policy decreased the number of English lessons per week from four to three at the junior high school level, which resulted in a 25% decrease in English…

Despite growing concerns about declining scholastic abilities of Japanese students throughout Japan prior to the implementation of the revised Courses of Study in 2002, little empirical evidence was available at that time to support this perceived decline in academic performance. This research describes post-hoc IRT equating of previously…

The use of a three-parameter logistic model for applying latent trait theory has become more popular because of the availability of computer programs. The program Logist 5 can be used not only for the item parameter estimation in the three-parameter logistic model, but also in the two parameter logistic model by setting the third parameter equal…