@subsubheading Description

The (approximately) quarterly approval rating for the President of the United
States from the first quarter of 1945 to the last quarter of 1974.

@subsubheading Format

@table @code
@item date
Approximate date of the observation.
@item approval
Approval rating (%).
@end table

@subsubheading Details

The data are actually a fudged version of the approval ratings. See McNeil’s book
for details.

@subsubheading Source

The Gallup Organisation.

@subsubheading References

McNeil, D. R. (1977). @cite{Interactive Data Analysis}. New York: Wiley.

@subsubheading Examples

@example
@INCLUDE_DATASET_EXAMPLE_SCRIPT{presidents_1.m}
@end example
