The schoolsubjects data come from BSMG Chapter 5 and 6 who reference
the data originally coming from Lawley and Maxwell (1971 p. 66).  It
is a very simple data set, 6 variables which is good to use for
instructive purposes introducing EFA rotation, and CFA.

The 6 variables represent 220 boys marks in 6 different school subject
areas: Gaelic, English, History, Arithmetic, Algebra, Geometry

The data given is the correlation matrix for these 6 variables.  It is
of interest to see if these subject matter areas are "measuring" any
underlying latent variables, e.g. reading ability, math ability.