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estimate_cbsem
estimate_cfa
Specifies inter-item covariances that should be supplied to CBSEM estimation (estimate_cbsem) or CFA estimation (estimate_cfa)
associations(...)
A matrix of items that covary.
One or more associations defined by item_errors
item_errors
covaries <- associations( item_errors(c("a1", "a2"), c("b1", "b2")), item_errors("a3", "c3") )
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