Help System (web edition)

/DCONTOUR <data>,<classvar>,<xvar>,<yvar>                / K.Vehkalahti
plots a scatter diagram of <xvar> and <yvar> in <data> grouped by <classvar> 
and adding the contour ellipses for each group. Specifications CONTOUR and
POINT can be used. The default values are CONTOUR=0.95 and POINT=<classvar>.
The <classvar> may be of either numeric or string type. Its classification
is sought automatically.

This sucro is useful for example in discriminant analysis, giving a plot of
discriminant space grouped by the classifying variable and each group having
its own confidence ellipse.
By activating the command in a slightly simpler form
/DCONTOUR <data>,<classvar> 
and giving the numeric variables with the MASK specification adds the vectors
describing the correlations of the variables and the discriminators. In that
case, the <xvar> is activated by X and <yvar> with Y. The variables that were
used in computing them (e.g. with /DISCRI or DISCR) are activated with A.

The sucro gives the user a ready made work scheme, where various parameters
can be modified, and the picture then easily re-produced. A PostScript
version of the picture can be created from that scheme by one sucro command
as well.

  P = More information on composite plots