[R] sleep data

Charles C. Berry cberry at tajo.ucsd.edu
Wed Jan 17 19:48:13 CET 2007

Yes, you refer to

 	Cushny, A. R. and Peebles, A. R. The action of optical isomers: II
 	hyoscines. The Journal of Physiology, 1905, 32: 501.510.

which was used by 'Student' to illustrate the paired t-test.

This is indeed a crossover design.

On Wed, 17 Jan 2007, Tom Backer Johnsen wrote:

> When reading the documentation for the "sleep" data set in R, the
> impression is clear, this is an "independent groups" kind of design
> (two groups of 10 subjects each).  However, when browsing the original
> article (referred to in the help file), my impression is quite clear,
> this is really a "repeated measures" kind of data (one group of 10
> subjects, two observations).  What is correct?
> Tom
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Charles C. Berry                        (858) 534-2098
                                          Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	         UC San Diego
http://biostat.ucsd.edu/~cberry/         La Jolla, San Diego 92093-0901

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