On 4/10/2007, at 8:29 AM, Peter Dalgaard wrote:
> Rolf Turner wrote:
>> P.S. ***Are*** there any risks/dangers in following Christos
>> Hatzis' suggestion of simply doing
>>
>> levels(fff) <- c("U","A","S") ???
> Not if the levels are right to begin with.
>
> Problems only arise if fff somehow becomes a two-level factor, e.g.
> if you do
> fff <- fff[2:3, drop=TRUE].
Ah-ha. The light dawns. And one should ***never*** assume that the
levels are right to begin with ---- Murphy's law being what it is!
Thanks.
cheers,
Rolf
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