This function constructs the immunization date per individual
by searching for the vaccine dates that satisfy the condition:
vacc_date_col + immunization_delay <= limit_date, where
limit_date is defined following the hierarchy:
censoring_date_col, outcome_date_col, end_cohort. If a date is not
provided/found the function takes the next one in the hierarchy.
If several columns with vaccine dates are provided, the function selects
by default the closest vaccine date to limit_date. However, it can also
select the first vaccine date by setting take_first = TRUE.
Usage
get_immunization_date(
data_set,
outcome_date_col,
censoring_date_col = NULL,
immunization_delay,
vacc_date_col,
end_cohort,
take_first = FALSE
)Arguments
- data_set
data.framewith cohort information (see example).- outcome_date_col
Name of the column that contains the outcome dates.
- censoring_date_col
Name of the column that contains the censoring date. NULL by default.
- immunization_delay
Characteristic time in days before the patient is considered immune.
- vacc_date_col
Name of the column(s) that contain the vaccine dates.
- end_cohort
End date of the study.
- take_first
FALSE: takes the latest vaccine date.TRUE: takes the earliest vaccine date.