Keywords that can be used in the list of original
values are LO (or LOWEST), HI (or HIGHEST), THRU, MISSING, SYSMIS, and ELSE. Keywords that can be used in place
of a new value are COPY and SYSMIS.
THRU specifies
a value range and includes the specified end values.
LOWEST and HIGHEST (LO and HI) specify the lowest
and highest values encountered in the data. LOWEST and HIGHEST include user-missing values but not the system-missing value.
MISSING specifies
user-missing and system-missing values for recoding. MISSING can be used in the list of original
values only.
SYSMIS specifies
the system-missing value and can be used as both an original value
and a new value.