The data are taken from the classic 1939 study by Karl J.
Holzinger and Frances Swineford. Twenty-six tests intended to
measure a general factor and five specific factors were
administered to seventh and eighth grade students in two schools,
the Grant-White School (n = 145) and Pasteur School (n = 156).
Students from the Grant-White School came from homes where
the parents were American-born. Students from the Pasteur
School came from the homes of workers in factories who were
foreign-born.
Data for the analysis include nineteen test intended to measure
four domains: spatial ability, verbal ability, speed, and memory.
Data from the 145 students from the Grant-White School are
used.