%0 Journal Article %T IRT in SPSS Using the SPIRIT Macro %A Jack DiTrapani %A Minjeong Jeon %A Nicholas Rockwood %J Applied Psychological Measurement %@ 1552-3497 %D 2018 %R 10.1177/0146621617733956 %K item response theory %K latent variable models %K Rasch model %K polytomous models %K differential item functioning %U https://journals.sagepub.com/doi/full/10.1177/0146621617733956