risk package:AA R Documentation
Survival of Multiple Myeloma Patients
Description:
The 'risk' data frame has 21 rows and 4 columns.
Data on survival of multiple myeloma patients following two
different chemotherapy treatments in a Cancer and Leukaemia Group
B trial. The data contain outcomes for 156 patients at 21
institutions, an average of 7.4 patients per institution.
Usage:
data(risk)
Format:
This data frame contains the following columns:
'n1' the number of patients following treatment method one;
'y1' the number of survival patients following treatment method
one;
'n2' the number of patients following treatment method two;
'y2' the number of survival patients following treatment method
two.
Source:
The data were obtained from
Lipsitz, S.R., Dear, K.B.G., Laird, N.M. and Molenberghs, M.
(1998). Tests for homogeneity of the risk difference when data
are sparse. _Biometrics_, *54*, 148-160.
References:
Brazzale, A.R., Davison, A.C. and Reid, N. (2007). _Applied
Asymptotics: Case Studies in Small-Sample Statistics_. Cambridge
University Press, Cambridge. Example 4.4.
Examples:
data(risk)
attach(risk)
boxplot(y1/n1, y2/n2, xlab = "treatment method", ylab = "proportion of survival")
detach()