Thanks for your reply Jim,
I've realized that in my data R recognizes the value "missing" as authentic NA.
So, in conclusion, I really have:
> DT
id date
1: 1 1997-04-26
2: 1 NA
3: 4 1998-08-25
4: 4 NA
5: 4 1998-11-07
And if I do:
> sum(is.na(DT$date))
The result is 2. So I've applied your suggestion and there are not changes in
date variable. Can you help me?
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