Message-ID: <x2vg636zwp.fsf@biostat.ku.dk>
Date: 2002-08-22T08:49:58Z
From: Peter Dalgaard
Subject: two bugs ?
In-Reply-To: <IPECKKKLFINFHEGMEKKGCEHJCCAA.ken_lee@tynesys.com>
"ken_lee" <ken_lee at tynesys.com> writes:
> Dear,
> I thought these two example are bugs.
> example 1: colnames issue
> > tmp<-data.frame(value=1:3,group1=1:3)
> > if (length(tmp$group)>1) z<-1 else z<-2
> > print(z)
>
> [1] 1
tmp$group is 1:3 because of partial matching in "$" (which is not a
bug, but maybe a design infelicity).
> example2 : length issue
> > tmp<-data.frame(value=1:3,group=c("a","a","b") )
> > tmp1<-gsummary(tmp,FUN=length,groups=tmp$group)
> > tmp1
> value group
> a 2 a
> b 1 b
>
> > tmp<-data.frame(value=1:3,group=c("a","c","b"))
> > tmp1<-gsummary(tmp,FUN=length,groups=tmp$group)
> > tmp1
> value group
> a 1 a
> b 3 b
> c 2 c
That's how gsummary (from nlme) works. Look at the definition of FUN.
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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