Counting Customers Who Bought The Same Products – Vizible Difference
I wrote previously a post on how to count customers who bought both A and B. Today someone asked how to count those who all bought the same N items. N>=2. He specifically requires a multiple choice filter so that people can select some items and only those who bought them all are showing. (All right, the problem is paraphrased.)
In the previous post, the purpose is to map out the tallies for all possible pairs of products and to study the correlation between products. Here we only need to show the customers who bought one set of products.
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