A further note. The Cushny & Peebles article can be viewed here: http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1465734
and the page with the data is here: http://www.pubmedcentral.nih.gov/pagerender.fcgi?artid=1465734&pageindex=9 A machine readable version of the data is at: https://biostat.ucsd.edu/~cberry/t-test/sleep.dat The version published in Student's Biometrika article has a typographical error, but it is evident that Student's computations were unaffected. Chuck Berry On Wed, 17 Jan 2007, Charles C. Berry wrote: > > 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 >> >> ______________________________________________ >> R-help@stat.math.ethz.ch mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> > > Charles C. Berry (858) 534-2098 > Dept of Family/Preventive Medicine > E mailto:[EMAIL PROTECTED] UC San Diego > http://biostat.ucsd.edu/~cberry/ La Jolla, San Diego 92093-0901 > > > > Charles C. Berry (858) 534-2098 Dept of Family/Preventive Medicine E mailto:[EMAIL PROTECTED] UC San Diego http://biostat.ucsd.edu/~cberry/ La Jolla, San Diego 92093-0901 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.