PROC CONTENTS provides a useful listing of information about a dataset, such as the names
and formats of the variables. For the following example, data were obtained from Foundations
of Education, 5th Edition by A. C. Ornstein and D. U. Levine (Houghton Mifflin, Boston, 1993).
The variables represent countries, the education expenditures per student in American dollars,
gross domestic product per capita in American dollars, and ratio of pupils to teachers.