Message-ID: <644e1f320911081130q459149d4t163a3a19478fa63a@mail.gmail.com>
Date: 2009-11-08T19:30:35Z
From: jim holtman
Subject: Turn dates into age
In-Reply-To: <26256656.post@talk.nabble.com>
What is the frame of reference to determine the age? Check out 'difftime'.
On Sun, Nov 8, 2009 at 1:50 PM, frenchcr <frenchcr at btinternet.com> wrote:
>
> Ive got a big column of dates (also some fields dont have a date so they have
> NA instead),
> that i have converted into date format as so...
>
>
> dates<-as.character(data[,"date_commissioned"]); # converted dates to
> characters
> dates[1:10]
> [1] "19910101" "19860101" "19910101" "19860101" "19910101" "19910101"
> "19910101" "19910101" "19910101" "19910101"
>
> dateObs <- as.Date(dates,format="%Y%m%d")
> dateObs[1:10]
> [1] "1991-01-01" "1986-01-01" "1991-01-01" "1986-01-01" "1991-01-01"
> "1991-01-01" "1991-01-01" "1991-01-01" "1991-01-01" "1991-01-01"
>
>
>
> Now i need to turn the dates into AGE, how do i do it? Im not worried about
> fractions of years, whole years would do.
>
>
> --
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>
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--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?