The matrix data file can include three special variables
created by the program: ROWTYPE_, ID, and VARNAME_.
The variable ROWTYPE_ is a string variable with the value PROX (for proximity measure).
PROX is assigned value labels containing the distance measure used
to create the matrix and either SIMILARITY or DISSIMILARITY as an identifier.
The variable VARNAME_ is a short
string variable whose values are the names of the new variables. The
variable CASENO_ is a numeric variable
with values equal to the original case numbers.
ID is included
only when an identifying variable is not specified on the ID subcommand. ID is a short string and takes the value CASE m, where m is the
actual number of each case. Note that m may not be consecutive if cases have been selected.
If an identifying variable is specified on the ID subcommand, it takes the place of ID between ROWTYPE_ and VARNAME_. Up to 20 characters
can be displayed for the identifying variable.
VARNAME_ is a
string variable that takes the values VAR1, VAR2, ..., VARn to correspond to the names of the distance
variables in the matrix (VAR1, VAR2, ..., VARn, where n is the number of cases in the largest
split file). The numeric suffix for the variable names is consecutive
and may not be the same as the actual case number.
The remaining variables in the matrix file are the
distance variables used to form the matrix. The distance variables
are assigned variable labels in the form of CASE m to identify the actual number of each case.