[R-sig-ME] Factor analysis with lme?

Kevin Wright kw.statr at gmail.com
Mon Feb 4 16:23:37 CET 2008

Just to follow up, I received no information regarding the factor
analytic model in lme, but learned that it can be done with asreml-r,

d1=d1[order(d1$B, d1$A),]
m1 = asreml(y ~ A, data=d1, rcov=~B:facv(A, 1))

K Wright

On Jan 30, 2008 2:17 PM, Kevin Wright <kw.statr at gmail.com> wrote:
> I'm looking for an example of how (if?) lme can be used with factor
> analysis.  By that, I mean modeling the residual variance/covariance
> matrix as
> Sigma = (Gamma)(Gamma)' + D
> where Gamma is a vector (or matrix) corresponding to latent variables
> and D is a diagonal matrix.
> I have looked around but have not found any examples.  Pointers,
> comments, and code are all welcome.
> K Wright

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