[R] conflicting results on NA in a qda predicted object:

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From: Agustin Lobo (alobo@ija.csic.es)
Date: Thu 20 Dec 2001 - 21:22:22 EST 

Message-id: <Pine.OSF.3.96.1011220111222.13471A-100000@ija.csic.es>

Dear list,

(I've not upgraded to R1.4 yet)

I have the following $class component in a predict.qda object:
> unique(mod23S.qda.pred$class)
 [1] 12 17 8 10 4 9 5 13 14 19 20 15 6 3 7 1 23 11 18 21 16 2 22 NA
Levels: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Nevertheless, when I try to identify the individual(s) with NA, I get:
> any(is.na(mod23S.qda.pred$class))
[1] FALSE

and

> mod23S.qda.pred$class[is.na(mod23S.qda.pred$class)]
factor(0)
Levels: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

So, actually, is there a NA value in mod23S.qda.pred$class or not?

(screening by eye it`s impossible:
length(mod23S.qda.pred$class) is 26375 )

Agus

Dr. Agustin Lobo
Instituto de Ciencias de la Tierra (CSIC)
Lluis Sole Sabaris s/n
08028 Barcelona SPAIN
tel 34 93409 5410
fax 34 93411 0012
alobo@ija.csic.es

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