gastric {YPmodel} | R Documentation |
Data from Gastrointestinal Tumor Study Group
Description
A sample data set from the Gastrointestinal Tumor Study Group (1982),on comparing chemotherapy with combined chemotherapy and radiation therapy, in the treatment of locally unresectable gastric cancer. Each treatment arm had 45 patients, with two observations of the chemotherapy group and six of the combination group censored. Kaplan-Meier plots of the two estimated survival curves cross at around 1000 days.
Usage
data(gastric)
Format
A dataframe with 90 observations on the following 3 variables.
V1
Lifetime vector (unite: year), where
X = \min(T, C)
andT
is the pooled lifetimes of the two groupsV2
Censor indicator vector, where
\delta = I(T \leq C)
andI(\cdot)
is the indicator function.V3
Group indicator vector, where
Z = I(i > n_1)
,i = 1, ..., n
andn_1 < n
is the size of the control group.
References
GASTROINTESTINAL TUMOR STUDY GROUP (1982). A comparison of combination chemotherapy and combined modality therapy for locally advanced gastric carcinoma. Cancer.
See Also
Examples
library(YPmodel)
data(gastric)