[R] calculating age from year of birth and date?

[Dimitri Liakhovitski]

And what is the format for year of birth in Excel?
Can't you use "concatenate" to concatenate a new column (that contains
only 19) and the column that contains a 2-digit year of birth?
And then change all those who are born (in the new column) before 1910
to XX+100 - which will give you 2009 (or 2001), etc.?

On Wed, Apr 21, 2010 at 9:57 AM, Vlatka Matkovic Puljic
<v.matkovic.puljic at gmail.com> wrote:
> Hi,
>
> well...when imported to R (from xls file) it transform to number
> print(D1)
>    [1] 39804 39527 39917 39860 39489
> ???
> but in xls is dd/mm/yyyy
>
> and year of birth is as yy
> those born after 1999 are removed
>
>
> Dana 21. travnja 2010. 15:52 Dimitri Liakhovitski <ld7631 at gmail.com> je
> napisao/la:
>>
>> In what format are you dates?
>> Are they always like this: two digits for day, then one or two digits
>> for month, and four digits for the year?
>> Also - are any of your people born after 1999?
>>
>> Dimitri
>>
>>
>> 2010/4/21 Vlatka Matković Puljić <vlatka.m at gmail.com>:
>> > Hi,
>> >
>> > I have v1 (date of test) and v2 (year of birth).
>> >  v1             v2
>> > 15.5.2008   88
>> > 18.6.2009    54
>> >
>> > I want R to use only year in v1; and v2 see as 1988 and calculate age in
>> > v3.
>> > any ideas how to do that?
>> >
>> > --
>> > **************************
>> > Vlatka Matković Puljić
>> > 095/8618 171
>> >
>> >        [[alternative HTML version deleted]]
>> >
>> >
>> > ______________________________________________
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>> >
>> >
>>
>>
>>
>> --
>> Dimitri Liakhovitski
>> Ninah.com
>> Dimitri.Liakhovitski at ninah.com
>
>
>
> --
> **************************
> Vlatka Matkovic Puljic
> 095/8618 171
>



-- 
Dimitri Liakhovitski
Ninah.com
Dimitri.Liakhovitski at ninah.com