exact_age: Time elapsed (in years) since the dates of birth and event.

In qlifetable: Managing and Building of Quarterly Life Tables

Time elapsed (in years) since the dates of birth and event.

Description

Computes the time(s) elapsed (in years) between the date(s) of birth and the date(s) of event(s).

Usage

exact_age(
  date.birth,
  date.event,
  random.b = TRUE,
  random.e = TRUE,
  constant.age.year = FALSE
)

Arguments

date.birth	A character vector with the dates of birth in format either "yyyy-mm-dd" or "yyyy-mm-dd hour:min:secs" (for instance, "2016-01-20 12:00:00") of a population. If "hour:min:secs" is omitted the function imputes either "12:00:00", if 'random.b = FALSE', or a random hour by default.
date.event	A character vector with the dates of events in format either "yyyy-mm-dd" or "yyyy-mm-dd hour:min:secs" (for instance, "2016-01-20 12:00:00") of a population. If "hour:min:secs" is omitted the function imputes either "12:00:00", if 'random.e = FALSE', or a random hour, by default. This vector must have either length 1, when the aim is to compute the exact age of all the members of the population in the same temporal point or the same length as 'date.birth' when the aim is to compute for each member of the population the exact age in the moment of the event (e.g., death).
random.b	A 'TRUE/FALSE' argument indicating whether the exact moment ("hour:min:secs") when the birth occurs within the day is randomly selected. If TRUE, this overwrites "hour:min:secs" in 'date.birth' even if those have been declared. By default, TRUE.
random.e	A 'TRUE/FALSE' argument indicating whether the exact moment ("hour:min:secs") when the event occurs within the day is randomly selected. If TRUE, this overwrites "hour:min:secs" in 'date.event' even if those have been declared. By default, TRUE.
constant.age.year	A 'TRUE/FALSE' argument indicating whether the length of the year should be constant, 365.25 days, or variable, depending on the time lived for the person in each year since her/his dates of birth and event. By default, FALSE. The advantage of using a non-constant (person-dependent) length of year is congruence when estimating time exposed at risk: in each year the time exposed along the time and age axes will coincide.

Value

A numeric vector of the same length as data.birth

Note

If 'constant.age.year = FALSE' (default), the length of the year for each person is computed as a weighted average of the lengths of the years that the person has lived between the dates of birth and event using as weight the time lived for the person during each year.

Author(s)

Jose M. Pavia [e-mail]

Josep Lledo [e-mail]

References

Pavia, JM and Lledo, J (2022). Estimation of the Combined Effects of Ageing and Seasonality on Mortality Risk. An application to Spain. *Journal of the Royal Statistical Society, Series A (Statistics in Society)*, 185(2), 471-497. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1111/rssa.12769")}

See Also

coord_age, coord_time

Examples

dates.b <- c("1920-05-13", "1999-04-12", "2019-01-01")
dates.e <- c("2002-03-23", "2009-04-12", "2019-01-01")
exact_age(dates.b, dates.e)

qlifetable documentation built on April 19, 2023, 5:09 p.m.