@subsubheading Description

Data which show the effect of two soporific drugs (increase in hours of sleep
compared to control) on 10 patients.

@subsubheading Format

@table @code
@item id
Patient ID.
@item group
Drug given.
@item extra
Increase in hours of sleep.
@end table

@subsubheading Details

The @code{group} variable name may be misleading about the data: They
represent measurements on 10 persons, not in groups.

@subsubheading Source

Cushny, A. R. and Peebles, A. R. (1905). The action of optical isomers:
II hyoscines. @cite{The Journal of Physiology}, 32, 501–510.

Student (1908). The probable error of the mean. @cite{Biometrika}, 6, 20.

@subsubheading References

Scheffé, Henry (1959). @cite{The Analysis of Variance}. New York, NY: Wiley.

@subsubheading Examples

@example
@INCLUDE_DATASET_EXAMPLE_SCRIPT{sleep_1.m}
@end example
