Hi,
I need to understand the inconsistent behaviour of & and I operators when
used with NA.
The code below explains this inconsistency
> TRUE & NA
[1] NA
> FALSE & NA
[1] FALSE
> TRUE & NA
[1] NA
> FALSE | NA
[1] NA
> TRUE | NA
[1] TRUE
> TRUE == NA
[1] NA
> FALSE == NA
[1] NA
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