Arthritis {vcd} | R Documentation |
Data from Koch & Edwards (1988) from a double-blind clinical trial investigating a new treatment for rheumatoid arthritis.
data(Arthritis)
A data frame with 84 observations and 5 variables.
Michael Friendly (2000), Visualizing Categorical Data: http://hotspur.psych.yorku.ca/ftp/sas/vcd/catdata/arthrit.sas
G. Koch & S. Edwards (1988), Clinical efficiency trials with categorical data. In K. E. Peace (ed.), Biopharmaceutical Statistics for Drug Development, 403–451. Marcel Dekker, New York.
M. Friendly (2000), Visualizing Categorical Data. SAS Institute, Cary, NC.
data(Arthritis) ## construct a table of interest using xtabs() or structable() ## via formula structable(Sex ~ Treatment + Improved, data = Arthritis) ## via default interface attach(Arthritis) structable(Treatment, Sex, Improved) detach(Arthritis) ## via xtabs and ftable ftable(xtabs(~Treatment + Improved + Sex, data = Arthritis))