I have a df that looks like this:
df <- data.frame("Country" = c("A","A", "B", "C"), "Date" = c("2021-01-02", "2021-01-03", "2021-01-01", "2021-01-02"), "Age" = c(21,15, 27,42))
I would like to extend this df based on Date and Country. Desired output is:
full_df <- data.frame("Country" = c("A","A", "A", "B", "B", "B", "C", "C", "C"), "Date" = c("2021-01-01","2021-01-02", "2021-01-03", "2021-01-01","2021-01-02", "2021-01-03","2021-01-01","2021-01-02", "2021-01-03"), "Age" = c(NA, 21, 15, 27, NA, NA, NA, 42, NA))
How can I do this please?
