クラスサイズ及び学校移行に伴うクラスサイズの変化が小学校第 4 学年から中 学校第 2 学年までの国語，社会，理科の学力偏差値推移に与える影響.

Previous studies have not discussed the effect of class-size change that students experience accompanied by primary to secondary school transition. This study examined the impacts of the elementary school class size, the differences between class size and number of students in the same grade, and the transition to secondary school on norm-referenced standardized test score trends. We constructed the panel data of studentsʼ test scores in Japanese (n＝5,171), social studies (n＝4,109), and science (n＝4,994) from the fourth to eighth grades. Subsequently, we analyzed them using multilevel growth models. The results indicated that the small-class-size effect on fourth-grade scores in language, social studies, and science, and the interaction of enlarged class size and number of students in the same grade impacted decreasing trends of the scores in social studies and science. The underlying processes of these results remains unclear; however, without surveying teachers and students, this study analyzed five-year panel data covering the school transition period and introduced novel findings to the literature on class size. [ABSTRACT FROM AUTHOR]