The data are from two period cross-over design clinical trial for relief of heartburn, and listings of the data appear in Koch, Gitomer, Skalland, and Stokes (1983). The variables are as follows:
data(heartburn)A data frame with 60 observations and 9 variables.
centera factor vector for two centers
sequencea factor with levels AP and PA for sequence groups
agea numeric vector for age
sexa factor for sex with levels female and male
freqa numeric vector for weekly frequency of condition from previous medical history
MD1a numeric vector for time to relief from first dose during period 1
MD2a numeric vector for time to relief from first dose during period 2
res1a factor vector for relief status for period 1 (R = relief from first dose within 15 min, NF = no relief from first dose within 15 min)
ref2a factor vector for relief status for period 2 with same categories as res1
Koch G, Gitomer S, Skalland L, Stokes M (1983). "Some non-parametric and categorical data analyses for a change-over design study and discussion of apparent carry-over effects." Statistics in Medicine, 2(3), 397--412.