Convert MMWR format to date — mmwr_week_to

Adapted from cdcfluview::mmwr_week_to_date.

This function transforms MMWR epidemiological year+week (or year+week+day) to a date object. This was implemented based on the cdcfluview::mmwr_week_to_date function, which adapted similar functionality from the MMWRweek package.

Usage

mmwr_week_to_date(year, week, day = NULL)

Arguments

year: Vector of epidemiological year(s); must be same length as "week" and "day" (unless "day" is NULL)
week: Vector of epidemiological week(s); must be same length as "year" and "day" (unless "day" is NULL)
day: Vector of day(s); must be same length as "week" and "year" (unless set to is NULL); default is NULL and the day returned will be the first day of the epidemiological week (i.e., Sunday)

Value

Vector of date objects as with as many elements as input year(s), week(s), day(s)

References

cdcfluview package

Examples

mmwr_week_to_date(2020,1)
#> [1] "2019-12-29"
mmwr_week_to_date(2020,1,5)
#> [1] "2020-01-02"
mmwr_week_to_date(c(2020,2021,2022),c(1,2,8), c(1,1,7))
#> [1] "2019-12-29" "2021-01-10" "2022-02-26"