抄録
In this paper, we propose a new latent trait theory, which aims to explain reading process of a “IIiraganna”word. Because this mathematical model reflects actual psychological process, we believe that this model can yield more precise estimation of subjects' characteristics. Moreover, the item parameters and the index calculated by these parameters are used to discribe the items. We applied this model and estimation procedure(nonlinear LSQ method)to a real data, and showed this model has a good fit to the data and yielded reliable estimates of the ability parameters and item parameters.
