Data frame:gbsg

686 observations and 12 variables, maximum # NAs:0

Name	Labels	Levels	Storage
id			integer
age			integer
meno		2	integer
size			integer
grade	1:gradd1=0 gradd2=0,2:1 0,3:1,1		integer
nodes			integer
enodes			double
pgr			integer
er			integer
hormon		2	integer
d	censrec		integer
t	rectime/365.25		double

Category Levels

meno

postmenopausal
premenopausal

hormon

had tamoxifen
no tamoxifen