A data frame with 1931 observations from 1931 persons on the following 9 variables.
idIdentification number (enumeration).
enterStart age for the interval.
exitStop age for the interval.
eventIndicator of death;
equals TRUE if the person died
at the end of the interval, FALSE otherwise.
birthdateBirthdate as a real number (i.e.,
"1765-06-27" is 1765.490).
sexGender, a factor with levels male
female.
parishOne of five parishes in Scania, coded 1, 2, 3,
4, 5. Factor.
sesSocio-economic status at age 50, a factor with
levels upper and lower.
immigranta factor with levels no region
and yes.