compute_duration {healthdb}

Compute duration between two dates

Description

This function is meant to be for data frame input only and used with dplyr::mutate() to compute age or duration between two character or Date columns. If a vector of breaks is given, the output will be converted to factor with labels generated automatically.

Usage

compute_duration(
  from,
  to,
  lower_brks = NULL,
  unit = c("year", "day", "week", "month"),
  trans = FALSE,
  .transfn = lubridate::ymd,
  verbose = getOption("healthdb.verbose"),
  ...
)

Arguments

from

A character or Date vector for start dates.

to

A character or Date vector for end dates.

lower_brks

A numeric vector for lower breaks passing to the base base::cut() function to convert the numeric result to a factor. The level labels will be auto generated. For example, the level labels are c("<19", "19-24", "25-34", "35-44", "45-54", "55+") for lower_brks = c(0, 19, 25, 35, 45, 55). Default is NULL (no conversion).

unit

A character string specifying the unit of the output. One of "year" (default), "day", "week", or "month".

trans

A logical for whether transform both from and to with the .transfn function

.transfn

A function for transforming the inputs. Default is lubridate::ymd().

verbose

A logical for whether print summary of the out and warning for missing values. Default is fetching from options. Use options(healthdb.verbose = FALSE) to suppress once and for all.

...

Additional arguments passing to base::cut().

Value

A numeric or factor vector of the duration.

Examples

# toy data
n <- 5
df <- data.frame(id = 1:n,
start_dt = sample(seq(as.Date("1970-01-01"), as.Date("2000-12-31"), by = 1), size = n),
end_dt = sample(seq(as.Date("2001-01-01"), as.Date("2023-12-31"), by = 1), size = n))

# get age group at a cut-off
df %>% dplyr::mutate(
 age_grp = compute_duration(start_dt, "2023-01-01", lower_brks = c(0, 19, 25, 35, 45, 55))
)

# compute gaps between two dates in weeks
df %>% dplyr::mutate(
 gap_wks = compute_duration(start_dt, end_dt, unit = "week")
)