Jo?o Gama <jgama at liacc.up.pt> writes:
> Hi,
> A quick question:
> I have to vectors, say ar1 and ar2
>
> > ar1
> [1] "a" "c" "c" "a"
> attr(,"levels")
> [1] "a" "b" "c"
>
> > ar2
> [1] TRUE TRUE FALSE TRUE
>
> > table(ar1, ar2)
> ar2
> ar1 FALSE TRUE
> a 0 2
> c 1 1
>
>
> I would like to obtain:
>
> T F
> a 2 0
> b 0 0
> c 1 1
>
> The problem seems to be that level "b" in ar1 doesn't appear
in ar1.
> and Function "table" doesn't have any drop.unused.levels
parameter.
ar1 is not a factor there (giving it a levels attribute won't make it
a factor). Try
>
ar1<-factor(c("a","c","c","a"),levels=c("a","b","c"))
> ar2<-c(T,T,F,T)
> table(ar1, ar2)
ar2
ar1 FALSE TRUE
a 0 2
b 0 0
c 1 1
--
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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