*select

USE ALL.
COMPUTE filter_$=(SEX=2  &  AGE  <  30).
VARIABLE LABELS filter_$ 'SEX=2  &  AGE  <  30 (FILTER)'.
VALUE LABELS filter_$ 0 'Not Selected' 1 'Selected'.
FORMATS filter_$ (f1.0).
FILTER BY filter_$.
EXECUTE.


*recode

RECODE AGE (Lowest thru 18=1) (19 thru 49=2) (50 thru Highest=3) (ELSE=SYSMIS) INTO agegroups.
EXECUTE.


*compute age from birth and period

COMPUTE AGE_1=2015-BIRTH.
EXECUTE.


*compute altruism index

COMPUTE F4=(v8+v9)/2.
EXECUTE.