[R] plotting categoric vs. categoric

[David Winsemius]

temiz <temiz at deprem.gov.tr> wrote in news:478225E1.5010706
@deprem.gov.tr:

> hello
> 
> which graph can I use for categoric var. vs categoric var. ?

plot() works if there is a method for the class of object. Here is an 
example with contingency table given to plot() that appeared on the 
list last month:

tbl<-r2dtable(1,c=4*c(15,12,8,5),r=4*c(20,10,5,5))
tbl
#[[1]]
#     [,1] [,2] [,3] [,4]
#[1,]   27   23   21    9
#[2,]   18   11    5    6
#[3,]    8    6    2    4
#[4,]    7    8    4    1

# > class(tbl)
# [1] "list"
ITS=factor(rep(LETTERS[1:4]))
DMS=factor(rep(LETTERS[1:4]))
df<-data.frame(counts=unlist(tbl),expand.grid(DMS,ITS))
names(df)<-c("counts","DMS",   "ITS")
df
(df.tbl<-xtabs(counts~DMS+ITS,df))
#       ITS
#    DMS  A  B  C  D
#      A 27 23 21  9
#      B 18 11  5  6
#      C  8  6  2  4
#      D  7  8  4  1
plot(df.tbl)

-- 
David Winsemius