Extended Factor Analytic model

xfa() function

Factor analytic models are available in three forms in ASReml: FAk, FACVk and XFAk 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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