一种新的多维IRT模型——高阶IRT模型

A New Multidimensional IRT——Higher- Order IRT Model

早期的单维IRT模型忽视了测验多维性的可能,而多维IRT模型对各维度的划分不够明确,不能良好反应各维度能力的内涵。高阶IRT模型承认测验的多维性,以分测验划分维度,同时又将多个维度的能力统一到一个高阶的能力中,能够在了解被试各维度能力的同时,为被试提供整体的能力估计,它能更好地反映实际,并且适应大规模测验的需求。

hem Response Theory（IBT） is a well known theory which can reflect the relationship between latent trait and items. Howev- er,both unidimensional IR model and multidimentional IRT model are short at reflecting ability structure precisely and appropriately. The Higher - Order IRT（ H - O IRT） model is a multi - unidimensional model that uses in - test collateral information and represents it in the correlational structure of the domains through a higher - order latent trait formulation. H - O IRT model can provide both domain and the whole information, which is better fulfilling the needs of large - scale tests.