Each variable record represents a single variable. Variable records have tag code ‘7’. They have the following structure:
A few portable files that contain duplicate variable names have been
spotted in the wild. PSPP handles these by renaming the duplicates
with numeric extensions:
A few portable files with invalid format types or formats that are not of the appropriate width for their variables have been spotted in the wild. PSPP assigns a default F or A format to a variable with an invalid format.
Each variable record can optionally be followed by a missing value record, which has tag code ‘8’. A missing value record has one field, the missing value itself (a floating-point or string, as appropriate). Up to three of these missing value records can be used.
There is also a record for missing value ranges, which has tag code ‘B’. It is followed by two fields representing the range, which are floating-point or string as appropriate. If a missing value range is present, it may be followed by a single missing value record.
Tag codes ‘9’ and ‘A’ represent
LO THRU x and
x THRU HI ranges, respectively. Each is followed by a
single field representing x. If one of the ranges is present, it
may be followed by a single missing value record.
In addition, each variable record can optionally be followed by a variable label record, which has tag code ‘C’. A variable label record has one field, the variable label itself (string).