Aggregate ISO weeks into months with a dataset containing just ISO weeks

Question

My data is in a dataframe which has a structure like this:

df2 <- data.frame(Year = c(\"2007\"), Week = c(1:12), Measurement = c(rnorm(12, mean = 4, sd =          


        

Answer 1

using dplyr you can try:

require(dplyr)

df2 %>% mutate(Date = as.Date(paste("1", Week, Year, sep = "-"), format = "%w-%W-%Y"),
            Year_Mon = format(Date,"%Y-%m")) %>% group_by(Year_Mon) %>%
            summarise(result = median(Measurement))

As @djhrio pointed out, Thursday is used to determine the weeks in a month. So simply switch paste("1", to paste("4", in the code above.