[R] unique dates per ID

[Ulrik Stervbo]

Hi Farnoosh,

you can use unique in the R-base or distinct from the dplyr library.

Best
Ulrik

On Tue, 15 Nov 2016 at 06:59 Farnoosh Sheikhi via R-help <
r-help at r-project.org> wrote:

> Hi,
> I have a data set like below:
> Subject<- c("2", "2", "2", "3", "3", "3", "4", "4", "5", "5", "5",
> "5")dates<-c("2011-01-01", "2011-01-01", "2011-01-03" ,"2011-01-04",
> "2011-01-05", "2011-01-06" ,"2011-01-07", "2011-01-07", "2011-01-09"
> ,"2011-01-10"         ,"2011-01-11" ,"2011-01-11")deps<-c("A", "B", "CC",
> "C", "CC", "A", "F", "DD", "A", "F", "FF", "D")df <- data.frame(Subject,
> dates, deps); df
> I want to choose unique dates per ID in a way there are not duplicate
> dates per ID. I don't mind what department to pick. I really appreciate any
> help. Best,Farnoosh
>
>
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