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These are three ways of counting data in variables.
These are three ways of counting data in variables.
Presence: Does this element occur in a transaction at least once?
Presence: Does this element occur in a transaction at least once?
Count: How many times does this element occur in this transaction?
Count: How many times does this element occur in this transaction?
Sum: What is the sum of this quantity in this transaction?
Sum: What is the sum of this quantity in this transaction?
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