Hi Keith, Perhaps you do not want to go with calendar weeks: 365/7 = 52.14
as there are not an even number of weeks in a year, you may want to plot by week from your initial observation. As you are using as.Date, you could simply calculate weeks as: data$Week<-1+as.numeric(data$Date - data$Date[1])%/%7 Jim On Wed, Feb 6, 2019 at 4:52 PM Marlin Keith Cox <marlink...@gmail.com> wrote: > > Hello all, I did not attach data as this is probably simple answer that I > cannot find. > > I am collecting daily data and would like to plot the data by week but now > that we are into the new year, my plots started over with 01 after the last > week of the year. How can I continuously keep adding weeks such as 53, 54, > 55, 56, etc. instead of starting over? > > Below has worked for me until we moved into 2019. > > data$Date <- as.Date(data$TIMESTAMP,format="%m/%d/%y %H:%M") > data$Week1 <- strftime(data$Date,format = "%V") > data$Week<-as.factor(data$Week1) > > Keith > > M. Keith Cox, Ph.D. > Principal > MKConsulting > 17415 Christine Ave. > Juneau, AK 99801 > U.S. 907.957.4606 > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
