Military pilots sometimes black out when their brains are
deprived of oxygen due to G-forces during violent maneuvers, a
phenomenon called G-induced loss of consciousness (G-LOC).  Glaister
and Miller (1990) produced similar symptoms by exposing volunteers' lower
bodies to negative air pressure, likewise decreasing oxygen to the brain.
The following table lists eight subjects by age and by whether they
showed blackout-related signs (pallor, sweating, slow heartbeat,
unconsciousness).

The three variables in the dataset are:
   initials of subject -- 2 characters
   age in years
   syncopal signs      (0 = no, 1 = yes)