SPSS® 12.0 Command Syntax Reference

86 ADD FILES
FIRST and LAST Subcommands
FIRST and LAST create logical variables that flag the first or last case of a group of cases with
the same value on the BY variables. FIRST and LAST must follow all FILE subcommands and
their associated RENAME and IN subcommands.
• FIRST and LAST have only one specification, the name of the flag variable.
• FIRST creates a variable with value 1 for the first case of each group and value 0 for all
other cases.
• LAST creates a variable with value 1 for the last case of each group and value 0 for all
other cases.
• Variables created by FIRST and LAST are automatically attached to the end of the
resulting file and cannot be dropped.
Example
ADD FILES FILE=SCHOOL1 /FILE=SCHOOL2
/BY=GRADE /FIRST=HISCORE.
• The variable HISCORE contains value 1 for the first case in each grade in the resulting file
and value 0 for all other cases.
MAP Subcommand
MAP produces a list of the variables included in the new working file and the file or files from
which they came. Variables are listed in the order in which they exist in the resulting file.
MAP has no specifications and must follow after all FILE and RENAME subcommands.
• Multiple MAP subcommands can be used. Each MAP subcommand shows the current status
of the working file and reflects only the subcommands that precede the MAP subcommand.
• To obtain a map of the working data file in its final state, specify MAP last.
• If a variable is renamed, its original and new names are listed. Variables created by IN,
FIRST, and LAST are not included in the map, since they are automatically attached to the
end of the file and cannot be dropped.