[Rd] Cook's Distance in GLM (PR#9316)

[Heather.Turner at warwick.ac.uk]

Well I suppose a warning's not going to hurt. Even in a case like the 
occupationalStatus example where you know some points have been fitted 
exactly, it might be useful to be reminded that the standardised 
residuals for these points are then NaN and cannot be displayed. Of 
course when you don't know in advance that this issue will arise, there 
is even more reason to give a warning.

So I say add the warning,

Heather

Martin B. Maechler wrote:
> Thank you, Heather,
> I've committed a version of your patch (which also works when h_ii ~= 1).
> 
> BTW, when re-reading the code and previous postings about it,
> I've been convinced _ again _ that the function *should* warn when points with
> h_ii ~= 1 are suppressed.
> That latter change is not yet committed.
> 
> Martin Maechler, ETH Zurich

-- 
Dr H Turner
Research Fellow
Dept. of Statistics
The University of Warwick
Coventry
CV4 7AL

Tel: 024 76575870
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