brv data frame has 399 rows and 11 columns.
The data concern the possible effect of marital bereavement on
subsequent mortality. They arose from a survey of the physical and
mental health of a cohort of 75-year-olds in one large general
practice. These data concern mortality up to 1 January, 1990 (although
further follow-up has now taken place).Subjects included all lived with a living spouse when they entered the study. There are three distinct groups of such subjects: (1) those in which both members of the couple were over 75 and therefore included in the cohort, (2) those whose spouse was below 75 (and was not, therefore, part of the main cohort study), and (3) those living in larger households (that is, not just with their spouse).
id: subject identifier, a numeric vector
couple: couple identifier, a numeric vector
dob: date of birth, a date
doe: date of entry into follow-up study, a date
dox: date of exit from follow-up study, a date
dosp: date of death of spouse, a date (if the spouse was still alive
at the end of follow-up, this was coded to January 1, 2000)
fail: status at end of follow-up,
a numeric vector (0=alive,1=dead)
group: see Description, a numeric vector
disab: disability score, a numeric vector
health: perceived health status score, a numeric vector
sex: a factor with levels
Male
Female
}