Extended Factor Analytic model
analytic models are available in
three forms in ASReml: FAk,
where k is the number of factors.
The XFAk form is
a sparse formulation that requires an extra k levels to be
inserted into the mixed model equations for the k
factors. This is achieved by the xfa(f,k) model function
which defines a design matrix based on the design matrix for f
augmented with k columns of
zeros for the k factors.
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