[R] Support Counting

[psombe]

Hi,
   I'm new to R and trying to some simple analysis. I have a data set with
about 88000 transactions and i want to perform a simple support count
analysis of an itemset which is say not a complete transaction but a subset
of a transaction.
say

{A,B,D} is a transaction and i want to find support of {A,B} even though it
never occurs as only A,B in the entire set


 To this i needed to create a new itemsets class and then use the support
function but somehow the answers never seem to tally.

Thanks in advance
Srinivas

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