Abstract
TWO-WAY TABULATION OF DATA APER IT IS SHOWN THAT THE PROBABILITY OF AN OCCUPANT FATALITY GIVEN A CRASH IN A SINGLE-VEHICLE ACCIDENT IS INDEPENDENT OF VEHICLE SIZE IN AN AGGREGATE DATA SET. WHEN THE DATA SET IS PARTITIONED INTO 2 OCCUPANT AGE GROUPS, IT IS SEEN THAT BOTH OF THE AGE GROUPS HAVE HIGHER FATALITY RATES IN SMALLER CARS. THIS IS DISCUSSED AS AN EXAMPLE OF A PARADOX PRESENTED BY SIMPSON IN HIS 1951 PAPER. (Author/publisher).