Create an observation duration variable

Produces a derived variable that computes the number of days between observation_period_start_date and observation_period_end_date. Multiple non-overlapping observation periods are handled explicitly: sum all observed spells, or select the first, last, or longest spell.

Usage

omop_variable_obs_duration(
  name = "obs_duration",
  period_policy = c("total", "first", "last", "longest")
)

Arguments

name

Character; output column name (default "obs_duration").

period_policy

Character; one of "total", "first", "last", or "longest".

Value

An omop_variable object with format = "obs_duration" and a $derived metadata field.

See also

omop_variable, omop_variable_age

Examples

if (FALSE) { # \dontrun{
recipe <- omop_recipe(variables = omop_variable_obs_duration(),
                      outputs = omop_output(type = "wide"))
} # }