[R] Interaction of a dynamic number of factors

[Dimitris Rizopoulos]

do you mean something like this:

f1 <- gl(2, 2, length = 15)
f2 <- gl(3, 2, length = 15)
f3 <- gl(4, 2, length = 15)
f4 <- gl(5, 2, length = 15)

fcomb <- interaction(f1, f2, f3)
table(fcomb, f4)


I hope it helps.

Best,
Dimitris


Nigel Birney wrote:
> Hi, I have a dynamic table structure consisting of N factors (e.g. columns
> Factor_1, Factor_2,..Factor_N). 
> 
> I want to construct a table that has as rows the level combinations of
> factors F_1..F_n-1, and as columns the levels of the factor Fn. The cells of
> the table would contain the number of cases that correspond to these level
> combinations. How can I do this?
> 

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Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

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