Dear sir,
I am experienced statistician and R programmer, having machine learning passion. It will be a pleasure to accompagny you on your data mining project.
I understand that you'de like to perform the apriori algorithm and i guess you are trying to perform frequent itemset and association rules methods, that's a field on which i've already work to determine the best association rules according to performant indicators like the support confidence lift and so on. This work can be done on R with specific functions under arule package, and accurate functions, and even charts and plots could be performed for this task.
So please consider my offer, which is a welcome on.
Best regards