Deviance and AIC for consecutive approach

[OG]

Hi

Let's say a questionnaire has two subscales and we want to compare a unidimensional model to a consecutive approach. How can we define the consecutive approach in ConQuest to obtain one deviance value and AIC for that approach?

Table 9 in this document refers to a consecutive approach: "A Rasch Item Response Modeling Approach to Validation: Evidence Based on Test Content and Internal Structure of the Life Effectiveness Questionnaire"
http://escholarship.org/uc/item/1h79x0fd