On Jul 3, 2009, at 1:10 PM, John Lipkins wrote:
Dear All,
I want to create a table for several variables. As example. I have a
dataframe with following data:
Gender transport driving
1 0 1
0 1 0
1 0 1
Now I want to create a table in the following form:
gtd <- read.table(textConnection("Gender transport
driving
1 0 1
0 1 0
1 0 1
"), header=TRUE)
Gender
1 0
Transport 1 2 0
0 0 1
Driving 1 2 0
0 0 1
That's really two tables stacked on top of each other. The sum of its
entries is 2n.
with(gtd, rbind(
xtabs( ~ transport + Gender) ,
xtabs( ~ driving + Gender)
) )
0 1
0 0 2
1 1 0
0 1 0
1 0 2
In which the different percentages are being calculated (row/column).
Percentages? Don't see any in the requested output. Maybe you really
want CroosTables in the gmodels package.
I have
tried using ftable() but did not give the desired result (There are
a lot of
variables and the format makes it impossible to interpret).
You could think about using summary or one of its substitutes inside
an apply construction.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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