I am trying to construct a contingency table of factor levels defined
as (say 3) columns of a dataframe, X.
table(X) gives a one dimensional table.
apply(X,2,table) gives 3 marginal tables.
table(X$V1,X$V2,X$V3) gives the correct answer but isn't a useful
method for a general dataframe.
There is obviously a simple solution, but not so obvious to me.
Thanks in advance
Ross Darnell
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