[R] median for time data

uvilla maruchavez83 at hotmail.com
Tue Dec 1 19:16:23 CET 2009

Thanks a lot for your answer Jannis.
Actually, I should have specified what I`m trying to do.
I have a datafame which 3 colums, one is the "person ID", second is "Anfag"
and third is "Ende". The two time colums are in this way: "8:50:10", so I
have to calculate the medan of the Anfag colum and to determine the length
of the route.
When I use strptime() I just get NA NA NA
I`m new at using R, must finisth this work thoug

I guess Im doing totally wrong, actually everytime i try to use "POSIXct" it
doesn`t work

Thanks a lot

Jannis wrote:
> Hi,
> try to convert this to the R time format "POSIXct" or "POSIXlt" via 
> strptime(). Then you can simply substract them. I am not sure whether a 
> median can be calculated though (should be possible as POSIXct stores 
> the value as seconds since 1970....)
> Best
> Jannis
> uvilla schrieb:
>> Hi everybody
>> How do I do to calculate the median and average of a colum of time data
>> like
>> this: "8:50:10". I also need to plot the time difference between two
>> colums
>> Thanks a lot
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