[Rd] Incorrect handling of NA's in cor() (PR#6750)

[tlumley at u.washington.edu]

On Fri, 9 Apr 2004, Marek Ancukiewicz wrote:

>
> Dear Thomas,
>
> The question becomes: how do we rank missing values?

That's one of the questions.  It's not the only question.  Suppose x has
no missing values but y has a missing value.  Should the ranks for x be
based on the whole vector or just on the values where y isn't missing?

	-thomas