Message-ID: <200108051803.UAA11343@pubhealth.ku.dk>
Date: 2001-08-05T18:03:32Z
From: martin.lenze@to.com
Subject: xtabs, drop.unused.levels (PR#1041)
Full_Name: Martin Lenze
Version: 1.3.0 22.06.2001
OS: win32,x86
Submission from: (NULL) (194.221.251.1)
As a newbie I'm not sure, whether this is a bug, but I don't know how to get
around this behaviour:
> x <- list("A"=rep(c(1:5),30),
+ "B"=c(rep(letters[1:3],30),rep(letters[2:4],20)))
> y <- as.data.frame(x)
> xtabs(~A+B,y)
B
A a b c d
1 6 10 10 4
2 6 10 10 4
3 6 10 10 4
4 6 10 10 4
5 6 10 10 4
> y <- subset(y,B!="d")
> xtabs(~A+B,y,drop.unused.levels=TRUE)
B
A a b c d
1 6 10 10 0
2 6 10 10 0
3 6 10 10 0
4 6 10 10 0
5 6 10 10 0
I'd expect "xtabs" to drop "d".
Kindest regards
M. Lenze
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