S3 method for pcops objects
# S3 method for pcops
biplotmds(object, extvar, scale = TRUE)Returns an object belonging to classes 'mlm' and 'mdsbi'. See 'lm' for details.
R2vec: Vector containing the R2 values.
See also biplotmds for the plot method.
An object of class stops
Data frame with external variables.
if 'TRUE' external variables are standardized internally.
If a model for individual differences is provided, the external
variables are regressed on the group stimulus space
configurations. For objects returned from 'biplotmds' we use the plot method in
biplotmds. In the biplot called with plot() only the relative length of the
vectors and their direction matters. Using the vecscale argument in plot() the
user can control for the relative length of the vectors. If
'vecscale = NULL', the 'vecscale()' function from the 'candisc'
package is used which tries to automatically calculate the scale
factor so that the vectors approximately fill the same space as
the configuration. In this method vecscale should usually be smaller than the one used in smacof
by a factor of 0.1.