A data frame with 1931 observations from 1931 persons on the following 9 variables.
id
Identification number (enumeration).
enter
Start age for the interval.
exit
Stop age for the interval.
event
Indicator of death;
equals TRUE
if the person died
at the end of the interval, FALSE
otherwise.
birthdate
Birthdate as a real number (i.e.,
"1765-06-27" is 1765.490).
sex
Gender, a factor with levels male
female
.
parish
One of five parishes in Scania, coded 1, 2, 3,
4, 5. Factor.
ses
Socio-economic status at age 50, a factor with
levels upper
and lower
.
immigrant
a factor with levels no
region
and yes
.