NORMALIZATION Subcommand (MULTIPLE CORRESPONDENCE command)
The NORMALIZATION
subcommand specifies one of five options for normalizing the object
scores and the variables.
- Only one normalization method can be used in a given analysis.
VPRINCIPAL. Optimize the
association between variables. With VPRINCIPAL
, the categories are in the centroid of the
objects in the particular categories. VPRINCIPAL
is the default if the NORMALIZATION
subcommand is not specified. This is useful when you are primarily
interested in the association between the variables.
OPRINCIPAL. Optimize distances between objects. This is useful when you are primarily interested in differences or similarities between the objects.
SYMMETRICAL. Use this normalization option if you are primarily interested in the relation between objects and variables.
INDEPENDENT. Use this normalization option if you want to examine distances between objects and associations between variables separately.
The fifth method allows the user to specify any
real value in the closed interval [–1, 1]. A value of 1 is
equal to the OPRINCIPAL
method,
a value of 0 is equal to the SYMMETRICAL
method, and a value of –1 is equal to the VPRINCIPAL
method. By specifying a value
greater than –1 and less than 1, the user can spread the eigenvalue
over both objects and variables. This method is useful for making
a tailor-made biplot. If the user specifies a value outside of this
interval, the procedure issues a syntax error message and terminates.