#### 8.2.57.59 tblish.dataset.sleep ¶

Static Method: `out =` sleep `()` ¶

  Student’s Sleep Data

  #### Description ¶

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

  #### Format ¶

  `id`

    Patient ID.

  `group`

    Drug given.

  `extra`

    Increase in hours of sleep.

  #### Details ¶

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

  #### Source ¶

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

  Student (1908). The probable error of the mean. Biometrika, 6, 20.

  #### References ¶

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

  #### Examples ¶

      t = tblish.dataset.sleep;

      # TODO: Port to Octave