Comments & Questions:
1. There is a typo in the fourth row to count from the end of the last paragraph in the page 3. It should be revised to “That is to say … patterns (a) and (c)… “ instead of “That is to say … patterns (a) and (b)…”.
2. The joint correspondence analysis (JCA) is run first for screening the descriptive analysis of this study. It shows that the psychological items appear to unidimensional. But the JCA is unfamiliar to me so that the result of this analysis just as a description for me.
3. In general, the P-S item consists of p-part and s-part, and p-part consists of dichotomous items (yes/no) and s-part consists of polytomous items (5-point likert-type scale). Maybe the models used to fit the mixed-type items can be used in the future, such as the mixed-type model is the combination of the 3PLM (for dichotomous items) and the NRM or GPCM (for polytomous items).