Gonzalez Ruiz, Juan Ramon <jrgonzalez <at> ico.scs.es> writes: : : Dear R-listers, : : Does anybody know what is the correct source of "rats" dataset in survival package? : : The help gives the following information: : : Rat data from survival5 : Description: : 48 rats were injected with a carcinogen, and then randomized to : either drug or placebo. The number of tumors ranges from 0 to 13; : all rats were censored at 6 months after randomization. : Usage: : data(rats) : Format: : rat: id : rx: treatment,(1=drug, 0=control) : observation: within rat : start: entry time : stop: exit time : status: event status : Source: : Gail, Sautner and Brown, Biometrics 36, 255-66, 1980 : : but "rats" data.frame contains the variables: : : names(rats) : [1] "litter" "rx" "time" "status" : : It seems to be 150 rats grouped in 50 litters, and 1 mouse is treated at each one. So this dataset does not agree : with the description above mentioned. : : I am very interesting in knowing the reference of this data. : : PS/ BTW, the correct source of rats injected with a carcinogen is Gail, Santner and Brown,... :
Not sure what your question is but the rats data set is also in the mimR package and the ?rats help there may be of use. library(mimR) data(rats) ?rats ______________________________________________ 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
