A data frame containing the observations from the GBSG2 study.
Usage
data("GBSG2")
Format
This data frame contains the observations of 686 women:
horTh
hormonal therapy, a factor at two levels no and
yes.
age
of the patients in years.
menostat
menopausal status, a factor at two levels pre
(premenopausal) and post (postmenopausal).
tsize
tumor size (in mm).
tgrade
tumor grade, a ordered factor at levels I < II <
III.
pnodes
number of positive nodes.
progrec
progesterone receptor (in fmol).
estrec
estrogen receptor (in fmol).
time
recurrence free survival time (in days).
cens
censoring indicator (0- censored, 1- event).
Source
W. Sauerbrei and P. Royston (1999). Building multivariable prognostic
and diagnostic models: transformation of the predictors by using
fractional polynomials. Journal of the Royal Statistics Society
Series A, Volume 162(1), 71–94.
References
M. Schumacher, G. Basert, H. Bojar, K. Huebner, M. Olschewski,
W. Sauerbrei, C. Schmoor, C. Beyerle, R.L.A. Neumann and H.F. Rauschecker
for the German Breast Cancer Study Group (1994),
Randomized 2\times2 trial evaluating hormonal treatment
and the duration of chemotherapy in node-positive breast cancer patients.
Journal of Clinical Oncology, 12, 2086–2093.