The data is taken from an ovarian cancer study. The file Xdata.txt is a
tab-delimited type 3 data set (see file.type in pheno.list).
It contains the variables:
id The subject id
case.control Ovarian cancer status (0, 1)
BRCA.status Simulated data for breast cancer status (0, 1)
oral.years Years of oral contraceptive use
n.children Number of children
age.group Age group in 5 categories (1-5)
ethnic.group Ethnic group in 3 categories (1-3)
BRCA.history Personal history of breast cancer (0,1)
gynSurgery.history History of gynechological surgery (0, 1, 2)
family.history Family history of breast/ovarian cancer (0, 1, 2)