This function returns the weekday of a given date according to MMWR.
vector which can be coerced to class Date
vector of weekdays as a factor
Jarad Niemi firstname.lastname@example.org
y <- as.Date(paste(1999:2011, "-12-31", sep = ""))
data.frame(date = format(y), MMWRweekday = MMWRweekday(y))
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