| MMWRweek {MMWRweek} | R Documentation |
MMWR day, week, and year
Description
This function returns the MMWR day, week, and year for the Date(s) provided.
Usage
MMWRweek(date)
Arguments
date |
vector which can be coerced to class |
Details
The first day of any MMWR week is Sunday. MMWR week numbering is sequential beginning with 1 and incrementing with each week to a maximum of 52 or 53. MMWR week #1 of an MMWR year is the first week of the year that has at least four days in the calendar year. For example, if January 1 occurs on a Sunday, Monday, Tuesday or Wednesday, the calendar week that includes January 1 would be MMWR week #1. If January 1 occurs on a Thursday, Friday, or Saturday, the calendar week that includes January 1 would be the last MMWR week of the previous year (#52 or #53). Because of this rule, December 29, 30, and 31 could potentially fall into MMWR week #1 of the following MMWR year.
Value
data.frame with elements MMWRday (of the week), MMWRweek, and MMWRyear
Author(s)
Jarad Niemi niemi@iastate.edu
References
http://wwwn.cdc.gov/nndss/document/MMWR_Week_overview.pdf
See Also
Examples
y = as.Date(paste(1999:2011, "-12-31", sep = ""))
cbind(y, MMWRweek(y))