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| cushny   | R Documentation   |
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A data set from Cushny and Peebles (1905) on the effect of three drugs on hours of sleep, used by Student (1908)
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Description
~~~~~~~~~~~

The classic data set used by Gossett (publishing as Student) for the
introduction of the t-test. The design was a within subjects study with
hours of sleep in a control condition compared to those in 3 drug
conditions. Drug1 was 06mg of L Hscyamine, Drug 2L and Drug2R were .6 mg
of Left and Right isomers of Hyoscine. The detal1, delta2L and delta2R
are changes from the baseline control.

Usage
~~~~~

::

    data(cushny)

Format
~~~~~~

A data frame with 10 observations on the following 7 variables.

``Control``
    Hours of sleep in a control condition

``drug1``
    Hours of sleep in Drug condition 1

``drug2L``
    Hours of sleep in Drug condition 2

``drug2R``
    Hours of sleep in Drug condition 3 (an isomer of the drug in
    condition 2

``delta1``
    Change from control, drug 1

``delta2L``
    Change from control, drug 2L

``delta2R``
    Change from control, drug 2R

Details
~~~~~~~

The original analysis by Student is used as an example for the t-test
function, both as a paired t-test and a two group t-test. The data are
also useful for a repeated measures analysis of variance.

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 (1) , 1-25.

References
~~~~~~~~~~

See also the data set sleep and the examples for the t.test

Examples
~~~~~~~~

::

    data(cushny)
    with(cushny, t.test(drug1,drug2L,paired=TRUE)) #within subjects 

    error.bars(cushny[1:4],within=TRUE,ylab="Hours of sleep",xlab="Drug condition",main="95% confidence of within subject effects")

