PLS SEM on secondary data

[AneetaSimon]

Hi, can you help me with the following:
1) How to arrive at a global item while working with a formative model using secondary data?
2) What are the specifics to be kept in mind for a formative-formative analysis using secondary data?
3) How to account for a 4-cateogy categorical moderator used in the model?

[jmbecker]

1) If you don't have a variable that can act as a global single-item (representing the concept in whole) in your dataset, then you simply cannot do redundancy analysis. There is no way of creating such an item out of data.

2) The same evaluation and quality criteria that are also relevant for primary data.

3) If it is hard to justify that the moderator is quasi-metric/continuous given insufficient levels, you may add dummy coded representations of the levels into your model (and can also use them as moderators).

[AneetaSimon]

Thank you for the response.
Can redundancy analysis be omitted in this case, then?