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Preston Botter
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Yes, taking the sum could be one approach. However, if your sample is sufficiently large, you have many options. If you search for structural equation modeling (SEM) with categorical variables, you should find the best practices you are looking for (e.g., check this tutorial; also see Cai, 2013; and Edwards, Wirth, & Houts, 2012).

References

Cai, L. (2013). Factor analysis of tests and items.

Edwards, M. C., Wirth, R. J., Houts, C. R., & Xi, N. (2012). Categorical data in the structural equation modeling framework.

Preston Botter
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