Multicategorical logistic regression in LPA/LCA analysis

#1
Hi all,

I am doing an LPA analysis, and I would like to know when I have completed the category classification for the subsequent Multicategorical logistic analysis. What does a reference group I better set?

I have seen some papers that set a baseline group, after which all other groups are logistically regressed using the baseline group as a reference, like 1VS2, 1VS3, 1VS4 and so on. However, some papers take a constant change of reference group, like 1VS2, 2VS3, 3VS4, etc.

I would like to know which approach is more appropriate.
Best regards,
Zekai