Hi Bibek,
how about this?
dta<-read.table(textConnection("ID Time
1 3
1 6
1 7
1 10
1 16
2 12
2 18
2 19
2 25
2 28
2 30"),header=T)
dta$delta<-with(dta,ave(Time,ID,FUN=function(x)c(0,diff(x))))
dta
hth.
Am 14.12.2012 16:51, schrieb bibek sharma:
> Hello R User,
> In the sample data given below, time is recorded for each id
> subsequently. For the analysis, for each id, I would like to set 1st
> recorded time to zero and thereafter find the difference from previous
> time. I.e. for ID==1, I would like to see Time=0,3,1,3,6. This needs
> to be implemented to big data set.
> Any suggestions are much appreciated!
> Thanks,
> Bibek
>
> ID Time
> 1 3
> 1 6
> 1 7
> 1 10
> 1 16
> 2 12
> 2 18
> 2 19
> 2 25
> 2 28
> 2 30
>
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