Biplot of Constrained Regression Models
biplot is a generic function applied to RR-VGLMs and QRR-VGLMs etc.
These apply to rank-1 and rank-2 models of these only.
For RR-VGLMs these plot the second latent variable scores against the
first latent variable scores.
The object from which the latent variables are extracted and/or plotted.
See lvplot which is very much related to biplots.
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