Displaying 1 result from an estimated 1 matches for "date_exam".
2005 Dec 20
2
Time data
...Suppose that have the following data:
df <- as.data.frame(rbind(c(1,"10/08/1950","15/03/1998"), c(1,"10/08/1950","20/07/1998"), c(1,"10/08/1950","23/10/1998")))
names(df) <- c("ID", "date_birth", "date_exam")
where:
date_birth: is the date of birth
date_exam: date of examination
I used the following program to compute the value of the age :
difftime(strptime(as.character(df$date_exam), '%d/%m/%Y'), strptime(as.character(df$date_birth), '%d/%m/%Y'))/365.25...