From what you've said, I would guess it has something to do with the
scaling of the variables. SPSS variables can be either SCALE (i.e.,
interval scale properties), ORDINAL, or NOMINAL. To see which of
these your variables are set to, click on the Variable View tab in the
data window, and see the MEASURE column at the far right. The scaling
can be set manually, or via the VARIABLE LEVEL command in syntax.
Here's an example from the help files.
VARIABLE LEVEL sales95 sales96 (SCALE)
/region division (NOMINAL)
/expense (ORDINAL).
--
Bruce Weaver
bwe...@lakeheadu.ca
www.angelfire.com/wv/bwhomedir
"When all else fails, RTFM."
I seem to remember that this is a message which SPSS produces when it
encounters a less than fully legal copy of v14.
This message usually appears when all the variables in the dataset
are string and you are trying to use a procedure that only accepts
numerical variables.
Measurement level generally does not screen variables out of a dialog,
although it affects how some dialogs behave.
HTH,
Jon Peck