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occurrence
2006 Oct 21
2
Filling in a series
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 approaches to replace the NA values with
appropriate