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Shinrigaku Kenkyu : the Japanese Journal of Psychology|June 22, 2012
[A new method for estimating differential item functioning (DIF) for multiple groups and polytomous items: development of index K and the computer program "EasyDIF"]Ryuichi KumagaiEducational and Psychological Measurement|July 1, 2026
A Simple Approach for Differential Test Functioning Based on Sum ScoresYutaro Sakamoto, Ryuichi KumagaiShinrigaku Kenkyu : the Japanese Journal of Psychology|July 28, 2012
[Development of a short form of the Japanese big-five scale, and a test of its reliability and validity]Tsutomu Namikawa, Iori Tani, Takafumi Wakita, et al.International Journal of Behavioral Medicine|June 24, 2008
Improving the measurement accuracy of the effort-reward imbalance scalesAkizumi Tsutsumi, Noboru Iwata, Takafumi Wakita, et al.Pageof 1