DATA Subcommand (PROXMAP command)
[/DATA {MULTIVARIATE**} ] [= {EUCLIDEAN }]
{STANDARDIZED**}
{PROXIMITIES }
The DATA
subcommand specifies the type of data the cases and variables in the
data file represent. The choice is between MULTIVARIATE
(default) and
PROXIMITIES
.
MULTIVARIATE
- The data is multivariate and represent measures of objects on variables. With this keyword, the
variable list on the
SOURCEID
subcommands specify the variables from which to derive a proximity matrix. Distances between objects are computed to create this matrix, considering the measurement level of the variables (see the Data input subsection in the Overview section for details), and the distance function.The distance function can be chosen following the MULTIVARIATE keyword with keywords:
EUCLIDEAN
in which Euclidean distances are computed between cases.STANDARDIZED
in which Standardized Euclidean distances are computed between cases, which means computing Euclidean distances by using standardized variables. Standardization equalizes the contribution of each variable (Standardization to a sum of squares of either N or N-1 can be specified on theCRITERIA
subcommand).STANDARDIZED
is the default distance function, with sum of squares = N. PROXIMITIES
- The data contains proximity and represents a square matrix of measures between objects. With
this keyword, the variable list on the
SOURCEID
subcommands specify a proximity matrix directly.
Example
GET FILE ’states.sav’.
PROXMAP
/SOURCEID DATA = popul income illit life homic school freeze fail
NAME = $SRC1 .
In this example, the multivariate data (default) concern demographic and quality of life variables on the 50 US states. Standardized Euclidean distances are derived.
The single source gets the name $SR1 and label SOURCE 001 (default)