Actually I think its last _observation_ carried forward.
On 10/21/06, Gabor Grothendieck <[EMAIL PROTECTED]> wrote:
> The zoo package has na.locf (last occurrernce carried foward)
> for this purpose:
>
> > x
> [1] 1 NA NA NA NA 2 NA NA NA NA 3 NA NA
> > library(zoo)
> > na.locf(x)
> [1] 1 1 1
The zoo package has na.locf (last occurrernce carried foward)
for this purpose:
> x
[1] 1 NA NA NA NA 2 NA NA NA NA 3 NA NA
> library(zoo)
> na.locf(x)
[1] 1 1 1 1 1 2 2 2 2 2 3 3 3
On 10/21/06, Dennis Fisher <[EMAIL PROTECTED]> wrote:
> Colleagues
>
> After reading in some clinical data, I
Colleagues
After reading in some clinical data, I discovered that the subject ID
column contains entries only for the first record for each
individual; subsequent rows are recorded as NA. For example:
> 1
> NA
> NA
> NA
> NA
> 2
> NA
> NA
> NA
> NA
> 3
> NA
> NA
> ...
I can think of various
