From rjvbertin@hotmail.com  Wed Jun 19 17:58:13 2002
From: rjvbertin@hotmail.com (rjvbertin@hotmail.com)
Date: Wed, 19 Jun 2002 18:58:13 +0200 (MET DST)
Subject: levels() counter-intuitif? (PR#1693)
Message-ID: <200206191658.SAA04763@pubhealth.ku.dk>

Suppose I have a factor size with levels "small", "medium" and "large". 
Then, when I subset this factor:
>ss<-size[size!="medium"]
to get at the extremes,
>levels(ss)
....
Levels:  large medium small

The same happens with
>subset( size, size!="medium")

I understand that the resulting factor inherits the possible levels from its 
"parent", but I do not see in what that is useful. Intuitively, I would 
expect that levels(ss) return "small" and "large". For subset(), there might 
be an option to request inheritance of the number of levels.

RenE J.V. Bertin
College de France/LPPA
11, place Marcelin Berthelot
75005 Paris, France

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levels() counter-intuitif? (PR#1693)
rjvbertin@hotmail.com