SPSS® 12.0 Command Syntax Reference

ADD FILES 85
• DROP cannot be used with variables created by the IN, FIRST, or LAST subcommands.
• KEEP can be used to change the order of variables in the resulting file. With KEEP,
variables are kept in the order they are listed on the subcommand. If a variable is named
more than once on KEEP, only the first mention of the variable is in effect; all subsequent
references to that variable name are ignored.
• The keyword ALL can be specified on KEEP. ALL must be the last specification on KEEP,
and it refers to all variables not previously named on that subcommand. It is useful when
you want to arrange the first few variables in a specific order.
Example
ADD FILES FILE=PARTICLE /RENAME=(PARTIC=POLLUTE1)
/FILE=GAS /RENAME=(OZONE TO SULFUR=POLLUTE2 TO POLLUTE4)
/KEEP=POLLUTE1 POLLUTE2 POLLUTE3 POLLUTE4.
• The renamed variables are retained in the resulting file. KEEP is specified after all the FILE
and RENAME subcommands, and it refers to the variables by their new names.
IN Subcommand
IN creates a new variable in the resulting file that indicates whether a case came from the input
file named on the preceding FILE subcommand. IN applies only to the file specified on the
immediately preceding FILE subcommand.
• IN has only one specification, the name of the flag variable.
• The variable created by IN has value 1 for every case that came from the associated input
file and value 0 for every case that came from a different input file.
• Variables created by IN are automatically attached to the end of the resulting file and cannot
be dropped. If FIRST or LAST are used, the variable created by IN precedes the variables
created by FIRST or LAST.
Example
ADD FILES FILE=WEEK10 /FILE=WEEK11 /IN=INWEEK11 /BY=EMPID.
• IN creates the variable INWEEK11, which has value 1 for all cases in the resulting file that
came from the input file WEEK11 and value 0 for those cases that were not in the file
WEEK11.
Example
ADD FILES FILE=WEEK10 /FILE=WEEK11 /IN=INWEEK11 /BY=EMPID.
IF (NOT INWEEK11) SALARY1=0.
• The variable created by IN is used to screen partially missing cases for subsequent analyses.
• Since IN variables have either value 1 or 0, they can be used as logical expressions, where
1=true and 0=false. The IF command sets variable SALARY1 equal to 0 for all cases that
came from the file INWEEK11.